After reading The $21 Challenge, I thought I would see which other areas of my life I could apply the Challenge to.

First, I opened a separate bank account and now deposit $21 every week before I do anything else with my money. I see this as a type of retirement fund – it will be nice to see the funds in 30 years time!

My next $21 Challenge is to only put $21 worth of petrol in my car each week. I will park my car further away from where I need to go; this will save money and improve my fitness and wellbeing.

When my phone contract ends soon, I am going to challenge myself to spend no more than $21 on pre-paid phone credit each month - now that will be a challenge!

There are so many ways we can implement the $21 Challenge in our lives, thanks to Fiona and Jackie's inspirational book.

We have saved over $150 in seeds alone this past year. Instead of paying up to $5.00 for packets of seeds which may or may not sprout, we have started grabbing packets of seeds from the herb sections of Woolworths, Coles and IGA. Most mustard, coriander, fennel, cardamom or celery whole seeds that you get as a spice for cooking will sprout for you in your garden. These normally cost around $1.05 per packet and you will get a lot more seeds than if you bought them from a gardening shop. We also get the full dried peas (not freeze dried) from the soup section and have planted these successfully for three years now. They give us the sweetest sugar snap peas ever! A packet normally costs $1.53 and you get close to 100 seeds. In comparison to buy 'packet' seeds it would cost you over $12.

We also cut the ends off shallots and replant them, it takes about three weeks before they start to recover, but then you have an endless harvest of shallot leaves to use in salads. We do the same with old onions that have hidden themselves away in our cupboards and have sprouted. Plant them in your garden, let them go to seed and you will have a great seed stock for the next few years. No need to buy more!

Garlic can be done in the same way. Grab a clove and plant it flat end into the ground. After about four months you will get a great bulb of garlic from your original clove. Be aware that garlic from China or Mexico has been treated with Bromide (cancer causing agent) so only use Australian grown garlic.

Old potatoes and sweet potatoes that start sprouting can be replanted and will give a good yield. Just cut a 3cm piece around the sprouting part of the potato and plant it, from one potato alone you could get up to seven new plants.

Pumpkin, cucumber, capsicum and other vegetable seeds can be cleaned, dried and then planted out to give you more seed stock to play with. Try planting two different types of pumpkins near each other and you might get a hybrid created which tastes great. Our family had a butternut mix with a jap pumpkin and it was the sweetest tasting pumpkin we'd ever tried. We also let one or two of each vegetable go to seed so that next years planting will cost us even less. Our goal is to go totally self sufficient in the garden. So far we have an abundance of butter lettuce, silverbeet, rocket, mint, corn, tomatoes and sugar snap peas all from previously saved seeds.

I took on the $21 Challenge, and won! However, my husband was a rather grumpy participant; he loved the savings but not the lifestyle during Challenge week. As he goes away regularly, I decided that every night he's not home for dinner would become a $21 Challenge night for the kids and I - all meals must be made from ingredients I already have at home, and I can only use ingredients that have not been allocated for other meals. This saves money and gives me a night off cooking, as my Challenge meals are usually simple affairs, sometimes as easy as pancakes or toasted sandwiches.

The true value of the $21 Challenge became apparent when a friend was recently diagnosed with a severe form of leukaemia. She is a married mother of four boys and is embarking on a long therapeutic journey that will hopefully lead to a full recovery. As a way of helping her family, the parents at our school have banded together to make all their meals for the next three to six months. As they are a large family, with an above average food requirement, I was unsure how I could afford to help feed them each week. Thankfully, my husband was away the week my friend was diagnosed, so the kids and I lived off the $21 Challenge that week and all leftover money was put into making meals to freeze for my friend's family.

We now do the same thing whenever my husband is away – it's a great gift over the Christmas break to know that I can afford to cook and freeze meals for my friend's family, and look after my family at the same time. Thank you.

Making our own cleaners has saved us a fortune over the years and we have saved the environment a little too. '1001 Greener Household Hints' by John Schluter is full of simple household cleaning ideas and we went straight out and bought some five litre bottles, spray bottles and some of the suggested basic cleaning ingredients. The following instructions are from the book:

Air freshener: Mix one teaspoon of bicarbonate of soda with one tablespoon of white vinegar. Add two cups of water. Store the mixture in a pump spray bottle. Add scented oils for fragrance.

Spray and wipe cleaner: Mix two tablespoons of cloudy ammonia, a half cup of white vinegar, two tablespoons of washing-up detergent and four litres of warm water. We stored this in large labelled bottles and used in spray bottles as needed.

Bathroom disinfectant liquid: Dissolve 12 drops of eucalyptus oil in 1ml of methylated spirits and then add eight cups of warm water. We used this in spray bottles also.

We paid $5.00 for the book but have saved hundreds in the years since we began making our own cleaning products.

Make all your leftovers taste fantastic with this bulk white sauce mix. Makes enough for 24 servings and you can keep it in the fridge:

2 cups (500g) powdered milk (I use skim)
1 cup (250g) plain flour
2 teaspoons salt
1 cup (250g) butter or margarine.

Combine dry ingredients, add butter and blend until mix resembles dry breadcrumbs. Put in large air tight container. Store in fridge. Use within two months. I label the container with the date and method.

Method:-
To make sauce combine, 1/2 cup mix to 1 cup
cool water. Add flavourings to suit, for example, curry, vegetables, onions, cheese, whatever you like!

I am 22 years old and on a low income, but am well on the way to saving for my first house! I developed a simple system that keeps my savings goal at the forefront of my mind and encourages the support of those around me.

I've always found it hard to save, but one day I got a big piece of cardboard and wrote 'My House Deposit' at the top. On the right hand side I cut out images of a house, a kitchen and a loungeroom that I would love to own one day. On the left hand side I drew a giant thermometer and on the side wrote the figures $0 to $40 000 ascending, just like on a real thermometer. Whether or not I need $40 000 is irrelevant; I look at this table every day and whenever I save another $500, I colour in with a red crayon up to the amount on the tally. I use hints from Simple Savings, such as making my own lunch every day and not buying clothes if I don't need them and now whenever I make a purchase I think of my house deposit and how much I want it far more than a coffee or new shoes!

An unexpected bonus of having this chart is that I've found my family and boyfriend have become aware of my goals and I get lots of support along the way. This visualisation technique really does wonders, and most importantly you are making a concrete agreement with yourself and you stop losing sight of your goals. I'm already a quarter of the way to reaching mine!

This idea is for those who live in a home with a garden that is too small to have a compost bin. I use an empty garden pot, cut a square of one of those net bags oranges come in to cover the hole of the pot. Put in a layer of old potting soil (from a pot where the plants have had their day). Each day save your fruit and vegetable scraps in a container. Place in a layer of scraps, then cover with another layer of old soil. Repeat layer by layer until the pot is nearly full, ending with a layer of soil (water as you go).

Then, while the compost is breaking down and baking, plant some seasonal seedlings on top and in no time you will have potted colour and compost underneath, not only feeding your seedlings but ready for the garden when the flowers are spent at the end of the season. I sometimes benefit from crops of vegetables germinated from the seeds in the compost such as tomatoes, cucumbers, capsicum and butternut pumpkin.

This is a multi recycling exercise using unwanted orange bags, unused pots, old soil and fruit and vegetable scraps and, of course, it is a great medium for the latest seedlings. Instead of flowers on top you could plant your favourite herbs while the compost is baking.

My mother is chronically ill and disabled. She suffers from a rare type of auto-immune disease, called lupus, and is therefore allergic to most chemicals. This made cleaning difficult because she was allergic to most cleaning products, or those she wasn't allergic to were too expensive to buy on my carer's pension. Because Mum's disease is an auto-immune disease, I have to keep our house hospital-grade clean.

So I have come up with a fantastic recipe, and my house is spotless, smells great and is fresh and clean. The solution cleans and polishes everything, including windows. I have never seen glass and stainless steel taps look so clean.

This solution also lasts forever. Household cleaner used to cost me $80 per month, but now I buy detergent every three months, vinegar once a year at $1.50, washing soda every 18 months at $0.98c and eucalyptus oil once every eight months at $3.50 - a saving of $880 a year minus $20 for the few items I do buy. In total I've saved around $2640 over three years.

Household Cleaner

1 litre water
200ml vinegar
40ml detergent
40ml eucalyptus oil
2 dessertspoons of washing soda

Mix all ingredients together, and it's ready to use. Use 60ml of solution in warm water to wash your floors. Fill a spray bottle and use it to clean your table, benches and bathroom.

For just $10 I've finally discovered soft skin. I had always suffered from dry skin and, over the years, had spent a fortune on moisturisers in every price range. I never really found anything that I could put on at night which left my skin soft and moist in the morning. It seemed my skin was always thirsty. Then I read in Vogue magazine, about a woman who used Neutrogena Norwegian Hand Cream as a facial mask. She also suffered from dry skin and her dermatologist had advised her to do this. Having nothing to lose, I decided to give it a go myself. It costs well under $10 and is available at Priceline and in most supermarkets. I chose the fragrance-free one and can honestly say it is the best moisturiser I have ever used. I use it every day under make-up and my skin looks 'dewy' all day long. I apply more in the evening before bed and my skin feels lovely in the morning. I even apply it thickly as a mask sometimes, with great results - and it beats a facial in terms of how my skin feels the next day. So if you have dry or mature skin - give it a try. It is also amazing on dry feet - it really is a miracle! It's amazing to think of how many dollars I will save from now on on my new, simple skincare product!

A great way of enjoying a fun activity while learning a valuable skill is to teach your kids to cook. I set up cooking lessons once a week after school for my two girls and their two cousins in our kitchen at home. The focus is on one recipe each week, something they can bake and take home. It's all about the kids having hands-on fun and there is a lot of chatter and laughter. The kids love it!