Hell, they make digital photo picture frames, so why not shrink it down? Here's a one-square-inch box that has a small backlit screen and displays images of your choice. Its 512Kb of flash memory is more than enough for photos, as long as they are in jpeg. It also includes a rechargeable lithium battery. For a mere $50, now you can carry pictures of all 15 of your illegitimate children on your keychain.
Photo Keychain [Red Ferret]