I've been working on yet another redesign for the "display" layout.
What I'm thinking now is using a 3x3 grid on each face... positions 1, 3, 5, 7 and 9 would be slow color-changers, and positions 2, 4, 6 and 8 would be 3-in-1 leds that I could rig as color-organs. I found a nice (aka cheap) circuit to let me do that, since they don't have to be precise in the fall-over frequency detection.
It's a lot of LEDs, but they're relatively inexpensive. The thing I'm really struggling with now is what to mount them on. If I use circuit board, it'll drive the cost up significantly... copper-coated board is about $6 each, and I'd need 6 of them per cube... 1 to handle the electronics, the others to handle the LEDs.
Alternately, I can use something else to mount the LEDs on (since there'll be no active electronics on those boards), but then getting the power/signal to them becomes a quandary. I've been thinking about doing something like wire-wrapping. Could work. If I go that route, then I just need to find the material to mount the suckers on.
So many decisions to make regarding materials... sigh...
But the MoodCube is NOT dead!