Design your own stamp
This is kind of a stretch but a really cool idea. MyArtStamps.com will make real postage stamps of your own design. Some folks are using it as school fundraisers, where the kids' art becomes the stamp. But it costs $25 for twenty 41-cent stamps, or $1.25 per stamp. That's a pretty stiff price, but if you could sell them for $2 each you'd make 75-cents per, or $15 bucks per sheet of 20 stamps.
