Ordinary fingerprints on your iPhone 4? Passé. Fingerprints that can morph your iPhone 4 into a color changing chameleon!? Psychedelic. These heat sensitive backings, made by RF Laserworks, magically turn a variety of gnarly colors depending on the temperature (aka your finger).

It's made by the same guy behind the Grip Tape iPhone 4 backing. $12 [RF Laserworks]