My new declared project is to emulate the Mood Light Tile product from LEDIUM. My end result will not be nearly as good, but it will be less than the $500 for a 2x2 panel (8x8 shown) that they usually go for.  I'm thinking 2x3, controlled by a basic stamp.

Challenges:

• Find frosted frameless cubes, isolate each from bleedover
• Find bright RGB LEDs with an even wash