New cases for iPod change color with temperature
A company called proporta.com is selling new cases for the iPod nano that are quite unusual: their cases change color, so you don't need to choose a color by yourself.
The cases are made of a type of silicon than reacts to the temperature. The initial colors can be pink, blue, or charcoal. These color change gradually to white. According to the website of the company:
Can’t decide what colour case to chose for you iPod nano? Why not go for one of Proporta’s Colour Change Silicone Cases. Precision moulded from impact absorbent silicone to provide a thin yet durable protective skin to your mp3 player.Link