If you're feeling really creative you can always print your photos on sticker paper, but if you're like me and would rather have it done for you, check out Moo Stickers.
Earlier this year I shared that the company can turn your digital photos into unique business cards, but I just recently realized they could also turn them into cute little stickers. About $10 will get you a book with 90 full photos or designs. The stickers are printed on tear out sheets so you can share them and are the perfect size for decorating cards and small gadgets like your iPod or cell phone.
You can upload images and designs from flickr, vox, Second Life, Fotolog, Secret Stuff, Livejournal and Bebo.