An extension of the technology made popular in the 90s by Global Hypercolor - those t-shirts that reacted to body heat, changing colour when and where they got warm - these iPhone / iPod Touch covers are a little piece of retro rave culture in your pocket. £24.95 from the Apple Store.
PS. I visited Global's design HQ as part of my school work experience and found a pair of Global Hypercolor jeans in the sample cupboard. THANK GOD those never made it into production - can you imagine?? There does definitely seem to be a bit of love about for the t-shirts again at the mo but having been there and literally having got the T-shirt, I think this is one 90s revival I'll swerve.