Make Your Own Money Wallet.
How about that ... a wallet made out of money! MoneyWallet.org has step-by-step illustrated instructions on how you make your own wallet, in 1-2 hours, out of 20 $1 bills. I'd have to figure out how to add slots for credit cards and pictures of my kids - otherwise I'd be too tempted to sacrifice the wallet when I was short a couple bucks for a smoothie.
Someone needs to make jewelry out of those old toonies that would fall apart when it got cold enough.