Proporta has announced its new iPod nano case that changes colour in response to changing temperature.
Proporta's Colour Change Silicone Case responds to temperature rises - the case changes colour (gradually getting lighter) as it gets warmer.

The precision-moulded case also protects the music player, acting as a second skin. It adds little extra bulk, increasing the player's bulk by just one millimetre, the company claims.
The case offers access to all of the device's ports and controls and is currently available in hot pink, deep blue and charcoal.
UK pricing isn't yet available. It costs $19.95 in the US and Proporta offers global shipping for an additional £2.50.