Hi Renisa: Here is a Hometalk site that shows how to make a lot of different knobs, each and every one cute:)
It may be more cost effective to purchase ready-made knobs in bulk, rather than trying to make your own. Check out ebay.com for a large variety.
What type or style of knobs are you wanting?
If you have old knobs, you can spray paint them to match your decor.