Five years ago it would be too expensive to buy colour sensing consumer products. However with technology advancements things have changed a lot. Huey the Colour Changing Chameleon Lamp from ThinkGeek is affordable ($29.99) and a pretty sophisticated yet fun gadget. Put Huey down on any surface and he will light up and match the surface colour. The science behind it is really down to intelligent LEDs and an optical sensor inside Huey's body that detects the surface colour and then adjusts the LEDs accordingly to match it.