[Asher Glick] wrote in to share a project he has been working on with his friend [Kevin Baker], a 4x4x4 RGB LED ... cube has none of these extra components, solely relying on 16 of the Arduino ...

What’s the smallest RGB LED ... one-inch cube of glowey goodness. The cube itself was built with a PCB backplane designed in Eagle and fabbed at OSHPark. The LEDs are driven by an Arduino ...