An iPhone 4 Backing That Magically Changes Colors When You Touch ItCasey Chan8/15/11 1:20pm36EditPromoteDismissUndismissHideGo to permalink 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).