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You can write ANYTHING YOU WANT on them, like swear words or Justin Bieber's name. Find out how to make them here. You'll need chalkboard paint if you don't already have it lying around.
Theft-proof wallet. Haha. This is a actually a great idea, especially for those times when you have to leave your bag unattended, like at the beach (no one should see it unless they are going through your bag). It's right up there with disguising you digital camera as a disposable camera.
Ok, so these are on sale on Etsy for anywhere from $15-$45. Ridiculous! But super duper easy to make. I made my own from scrap fabric costing me ... $0!!!!! It is great to have and I love it (so a 5 for that) but it also got a 5 because of the price!