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.

I found a way to save almost $50 a year on liquid hand soap with hardly any effort! Just take a bucket filled with four litres of water. Drop a bar of generic soap into it and let it soak for 24 hours. Give it a mix and pour into clean two-litre milk bottles. Just top up pump bottles when needed. For a little added luxury, add half a cup of sorbolene cream and a few drops of glycerine. Works a treat!

When you are going out for a picnic or taking lunch to work or school, use cloth to wrap the sandwiches. This is much better than cling wrap or foil because it's cheap and reusable. I use tea towels, napkins and chopped up table cloths to wrap my sandwiches. The sandwiches stay fresh and when I've finished, I just shake off the crumbs and take the cloth home to be washed and used again.

There is something pleasantly old-fashioned about this method - and just think of all that plastic not going into landfill.

I have read lots of hints about ALDI, about how much money you could save by shopping there. I must say I was sceptical.

I have just returned from my second shopping trip at ALDI and I just had to share my excitement about how much I am saving. I used to shop fortnightly at Woolies, spending between $330 and $400 a fortnight. Now I divide my shopping between ALDI and Woolies. Last fortnight I spent $240; this time I have spent $167. The savings are obvious. I would recommend ALDI to anyone.

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.

Changing circumstances and a growing familly all added up to us paying a whole lot less off our mortgage than we would have liked. Pretty soon we would have started to go backwards. It was crunch time!

Using the Simple Savings calendar I identified our most expensive habits, and was astounded to see the amount of money that could have been saved. Our grocery bill was always around $200 or more per week. This amount did not include meat or bread that we get from the butchers and bakery.The trouble was, my husband loved all the expensive name brands for items such as chocolate biscuits, lollies and savoury snacks and was convinced that the cheaper or no name products would be tastless and boring. Week after week I would just automatically reach for these items, without even glancing at the alternatives. I knew as soon as my husband saw the packaging, the goods would remain in the pantry unopened, and he would then go and buy the brand name items anyway.

One week I kept mentioning to him that I was going to do a big clean up of the pantry and I was finally going to utilise all those assorted Tuppaware containers that I had never used. That week I substituted his expensive brand of snack foods with cheaper versions, emptied them into the assorted airtight containers and threw the plain packaging out before he could see them!

I also applied this technique to several other items; I would fill cheaper dishwashing liquid into Morning Fresh bottles, no-name hand wash into saved Palmolive dispensers, you get the picture. Our grocery bill went down from $200 to $140 per week - a saving of $240 a month!

When I finally fessed up to what I had been doing, my husband admitted that most of the snacks were just as good as the name brands, you just have to try a few out. All it took was some creative (OK, and somewhat deceitful) way to present the changes, but we have never looked back. Why would we, with a saving of $3120 a year? Plus of course, one very neat pantry!

I have saved a fortune on laminating costs over the years, by doing my own at home. I don't have a laminating machine though - I don't need one! I just buy the laminating pouches I need and get exactly the same effect using my household iron on a low setting. You just need to ensure you are working on a fairly rigid surface - if your ironing board is too 'spongy', strengthen the surface by adding a piece of cardboard, covered with cloth before laminating. When applying the iron, put a cloth or other fabric between the plastic and the iron. The results are just the same as using a machine and the heat will gently fuse the pouch together. I have done this for so long, that I don't know how much laminating costs any more, because I never pay to have it done!

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.

This simple bill payment system lets you take a holiday from paying bills at Christmas time.

Every time I receive a bill, I pay $10 more than the amount required. For example, if the monthly phone bill is $50, I pay $60. This has worked really well for me, and come December I am able to stop the phone, internet, power and rates payments. I use this money for Christmas gifts, safe in the knowledge that my bills are covered.

I have come up with a simple yet super effective way of making sure I never waste any more money on clutter! I'm a sucker for buying toys for my children. Consequently I am now drowning in broken toys, clutter and debt. But now when I'm in the department stores and see something on special or think, 'my girls would love that', I open up my bag and get out my deterrent! I look at the photos I have taken of my lounge covered in toys and clutter and remember that not am I only saving money by not buying more, I am also saving the planet - and my sanity! Works every time!