Too cool. I just saw in the Photojojo newsletter [1] that you can print text and - this part is new - photos on M&M's, the little candy-covered chocolates from Mars. This doesn't mean you can run an M&M through your HP inkjet, amusing as that is to imagine; instead you design your M&M's on the My M&M's Web site [2]. For any order, you can create up to four designs - two photos and two text messages. Photos should look good when printed in black food-grade ink at a size of about 1 centimeter, and if you think Twitter's 140 character limit is tight, try getting your message across in two lines of 8 characters each. Going beyond the obvious may be a bit tricky, since Mars is persnickety about what you're allowed to put on an M&M, so no "inappropriate" images, objectionable words or phrases, business or product names, drug references, or single letters. It's not cheap [3], needless to say, with a 7 ounce (198 gram) bag costing $11.99, and you have to buy at least three bags at a time.
[1]: http://photojojo.com/
[2]: http://www.mymms.com/customprint_faces/
[3]: http://www.mymms.com/pricing/pricing_popup.asp