AquaGlow Underwater Light Show
This gadget marks the last of the summertime gadgets here at the Dose - its somewhat of a crossover device though, as it runs on 3 AA batteries - it can light up any body of water. So yep, you could use it in a pool. However it works in hot tubs - ponds - heck, even the bath tub.
A floating disco ball designed with the pool or spa in mind. Get your groove on as colorful rays of dancing light bring an exciting party atmosphere to your backyard. Engulf your entire pool in a dramatic light show of patterns and colors. New for 2007: Includes a color lid and batteries.
Can’t really go wrong for the price either - $19.99 over at Amazon