I had a strand of 25 led's from adafruit laying around, and wanted to turn them into something cool, so why not a disco ball?
Each led got controlled RGB, and they are all controlled by only two wires.
Update 09-08-2012 #1
Added OpenSCAD files to adjust the hole in the stl file if tweaking is needed.
Update 09-08-2012 #2
I had some problems getting the parts to align up perfectly and stay that way, so I made this "cornerHolder", you can put the ziptie through that when you assemble the cube, and they will then make the sides align as they should and stay secure like that! :)