Multicoloured LEDs with integral control chips, prewired into sets of 50. These are WS2811 types with RGB LEDs, so provide a wide range of colours.
The controller is a preassembled item supplied with IR remote control, with various predefined patterns and colours. It is also possible to drive these from microcontrollers which would allow a much greater range of patterns and effects.
The LEDs and controller were purchased from sinonled, http://www.aliexpress.com/store/1051119
The power supply was o