One example is this one:
Disco Pod Lights
only £24.99 - on sale until 24/12/2008
SAVE £15.00 was £39.99
Order Code: L53AG
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Six coloured pod lights with rate control and sound response
Includes blue, red, orange, green, yellow and pink bulbs
Variable speed control
Variable sound-to-light response
Built-in microphone, no need to connect to audio source
Pods can be removed and locked into different shapes
Each channel has sensitivity controls and the central control unit has power, sensitivity and speed controls. The system is modular and each hexagonal pod can be removed, allowing the pods to be connected in shapes other than the picture shown. Spare bulbs available (Order code:R80 40W) ES Coloured Bulbs.
Full range of lighting on link below:http://www.maplin.co.uk/Search.aspx?criteria=disco&source=15