http://www.youtube.com/watch?v=sbKjKKVewDU

Tutorial:
http://learn.adafruit.com/3d-printed-camera-led-ring

Trying to get those pixel perfect macro shots on a budget? Build your own DIY low cost ring of light with a NeoPixel Ring and Trinket, Adafruit tiny arduino micro controller. The color and brightness of the LEDs can be programmed to color or pattern!

Using the 24x NeoPixel ring as a light ring is a great way to enhance macro-photography. A ring of light provides a spot-light effect, removing shadows caused by the camera getting in front of the subject. In our test shots above the NeoPixel Ring projects a ring of light inside the eye.