As a new member, I have saved $150 in my first week, thanks to the $21 Challenge! I thought I was careful with money until I discovered this site and realised how I could further improve my spending habits. I decided to give the $21 Challenge a go and it is now Thursday and I haven't been to the shops yet!

I have become a problem solver due to the fact that I must use what is in the fridge/freezer and pantry. I nearly buckled when my four year old wanted 'pink milk' and I had run out of Nestle Quick but no problem in the end. I found some rose pink food colouring and with just one drop - presto, pink milk! It does take some preparation because you are cooking from scratch but it is all worth it when your family tells you that the dinner you made tonight was the best, and is there any more?

My other dilemma was to use the three zucchinis in the crisper, so I made them into a slice. It was so easy to make and I had every ingredient on hand without even trying!

Zucchini Slice (serves 4-6)

3 zucchini (grated)
1 onion (grated)
1 potato (grated)
4 slices of ham/bacon (chopped)
1 cup of cheese (grated)
6 tablespoons flour (plain)
3 eggs
salt/pepper

Put all ingredients into a big bowl and mix really well. Pour into a quiche dish and cook in the oven for one hour at 160C. If you are vegetarian, simply leave out the ham. Simple, delicious and super cheap!

If you have an old bookcase that you no longer need, or is a little too unsteady to use as a bookcase you can transform it into a super cheap underbed storage container! All you need is to buy some castors from your local hardware store. Just screw the castors onto the back of the bookcase, lay it down on its back and roll it under the bed. We have one of these in our boys' room for all their toys and it really reduces all the visible clutter. It's lovely to walk in and all you see are their beds!

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.

Hard glasses cases are a great, cheap storage solution. I was looking for something to carry my make-up in for the holidays and my old hard case was perfect. It fitted everything I needed and the hard cover prevented any breakages. You also avoid the hassle of tipping out a soft make-up bag to find what you need! I then put the loose things in my glove box (screwdriver, scissors and pen) in another hard case and made myself a travelling tool kit. You could use them to store miniature sewing kits when travelling and much more. These cases are cheap to buy in second hand shops, and many are nicely decorated or you could do this yourself.

I add a supermarket gift card to my weekly grocery list and use them all up to shop for Christmas! After doing some calculations I realised that the ready-made Christmas hampers that you pay for weekly cost three times their actual value, not to mention the fact that they can include many products you won't ever use. My new system for buying Christmas groceries lets me buy my own hamper full of items at the current price or on special.

Toilet cleaning, deodorising and water conservation has never been easier.

You can kill three birds with one stone by piercing a few holes through the lid of a bottle of vinegar and putting the bottle in your toilet cistern. The weight of the bottle displaces the water meaning you use less water with each flush. The vinegar will slowly seep out, leaving your loo smelling nice and making cleaning easier. When the bottle is empty, simply refill it with homemade vinegar which is simply half a bottle of cheap white vinegar topped with rainwater. Leave for 24 hours and it will be full strength and ready to use.

Now, if we could only get men to leave the toilet seat down...

Our family home is always a clean and happy one, thanks to our weekly raffle! With four children aged from 12 down to two, there is always so much to get done, so we started our very own 'family raffle' as an incentive to get the chores done.

A list on the fridge displays all the categories for a raffle ticket. Some examples are - clean bedroom floor, do a load of laundry, give a music recital, finish homework by 5pm, clean the windows, play with the baby and so on. Every time a chore is completed, the child fills in a raffle ticket with their name and the task done. Then, every week at the same time, we pull out the prize winner. They receive a prize from the discount store - some kind of age appropriate toy such as a pack of cards, fancy pencils and so on, to a maximum value of $5.00. The remaining tickets are pulled out and all are given five points each. Every child who has reached 20 points during the week also receives $5.00. We get so much housework completed this way! We deposit the money in the children's bank accounts online and they are encouraged to save it, or can spend it on something special. This really helps when they need to buy a birthday gift for their friends and can even pay for their own outings and movie tickets. I read every chore they complete out loud and the pride in their faces is worth every cent!

My husband and I have become '30 Day Gourmets' and enjoy both the savings and the extra time we spend together as a result! We recently looked into 'Once a Month Cooking', which we were interested in because neither of us really enjoys cooking tea when all we really feel like doing is relaxing after being at work.

After gathering ideas of how the scheme works (literally - you cook once a month!), we thought we would try it by cooking for a fortnight first. We gathered recipes from the Internet and raided the recipe books (the recipe must be able to be frozen) and came up with such things as marinated chicken, curried sausages, spaghetti sauce, apricot chicken and all kinds of things.

We then picked a Sunday, turned up the stereo and did nothing but cook! It turned out to be a really enjoyable day. Once cooked and cooled, the food is put into freezer bags or takeaway containers (which cost almost nothing) and frozen. What we thought would last two weeks actually lasted three!

Each night, I would take out a container or bag for the next night and leave to defrost in the fridge. We then dragged out the steamer, threw in all the vegetables and once a week cooked up a big pot of rice. We would then have a small portion of meat (which also lowers fat-intake levels), have a pile of yummy steamed vegies and a little rice - the result being full bellies, smiling faces and very minimal washing up!

This not only saved us money but also time. Usually groceries cost us $150 for two weeks. With the cost of buying meat and grocery items needed for the cook-up ($100) and in-between buyings of vegetables once a week ($10), we spent a total of $130 when we would have spent over $150. (This is because at each shop we would grab things we liked, but didn't really need). Having a selection of meals already cooked for the weeks ahead feels great!

At first a big cook-up seems difficult if you aren't motivated, but you can start small and next time you are cooking something that would freeze well, cook double or triple the recipe and freeze excess. I also went to the local library and got out some books on freezer cooking which also had suitable recipes in them.

My husband and I honestly can't believe how we survived before our cook-ups and love the idea of actually doing things we want to each night, rather than being a slave to the kitchen!

NB - A book from the library which was a big help in planning recipes was 'The Freezer Cooking Manual from 30 Day Gourmet'. The '30 Day Gourmet' book is available on eBay and from most bookstores.

My husband and I have began saving up to $30 per week on our grocery bill since we invented 'Grandma's Day!' When we go to the supermarket we ask ourselves, 'would Grandma have been able to buy this item in her day 60+ years ago?' If the answer is no, then we decide we don't need to buy it either! This saves us money on a whole range of items such as fancy dips, designer coffees and biscuits. We used to pay over $3 for a pack of 10 biscuits, now I can make 12 biscuits for around $1. Using plain yoghurt as a base we are even making our own dips; there are so many websites with great dip ideas. Now we are saving valuable money and our waistlines too!