Check out 24 ultra bright smart LED NeoPixels arranged in a circle with 66mm outer diameter. These NeoPixel rings are chainable so that you can connect the output pin of the one to the input pin of another. Each LED is addressable as the driver chip is inside the LED. Supported by wonderfully-written Neopixel library for Arduino. Power the whole set up with 5VDC and you’re ready to bling!
Buy NeoPixel Ring – 24 x WS2812 5050 RGB LED with Integrated Drivers from Pakronics: