It looks like you have 100 RGB LEDs going on there, and a short BOM to boot. Nice work.
If im not mistaken, that looks like:
100 RGB LEDs
310 resitors
10 PNPs
4 shift registers.
424 parts. Thats pretty good when you consider that you are lighting up 300 LEDs.
Im not sure, but it looks like making a 10x10x10 cube is just another 10 more transistors.