These cool looking LED shower heads require no batteries as they are totally water powered and the LEDs change colour depending on the water temperature, these will be in Lidl from Monday 19/08/13 for £9.99 which seems pretty good value.
Product Information :-
Integrated temperature sensor lights up 12 LEDs in 3 different colours according to water temperature
No batteries required - water power lights up LEDs
2 spray functions: rain and foam
Chrome-plated body with easy-care anti-limescale soft nozzles
Dimensions approx. (mm): Ø 125 x 270 x 60
3 year manufacturer's warranty