Great idea! To be honest though I lean more towards toughening them and selling as nightclub lights. Even the smallest of places spends megabucks on their lighting rigs, and this would be a toy that every bored sound tech would love to play with :)

Edit: I'm not the only one to have thought about this: http://www.youtube.com/watch?v=_cLLyfop3QI

Edit2: This company appears to be offering them for sale in sizes up to 32x32x32: http://www.seekway.com.cn/e/ledsys9.htm