Physical Computing, Tangible Interface, TUI/NUI, Interactive Scultpure, Music Control, OSC
DIY monome - big buttons
So Sparkfun sells these button pads like the monome has, but bigger. Plus they have room for 3-color LEDs. Make or buy a monome logic board or two (schematic is on their site - they MIGHT be selling built logic boards and kits soon) and buy some Sparkfun pads, PCBs, 3-color LEDs and make your own tri-cube-omial or something.