RGB LED Cubes. Wow.
Original Concept / Unknown Designer
This will get your attention:
Now, go buy the kit: eightCubed
Apparently there is a whole community of people devoted to building LED sculptures that I didn't know about. I admire the skill of anyone who can assemble this - it is a stack of LED's - 512 in the above photo - that are held together using only their leads. Did I mention that each LED has 4 leads coming out of it? That is an amazing number of connections and effort.
The good news: You can download the schematics and the software to build on yourself
The better news: You can buy a 4x4x4 cube from Hypnocube.com and VisualCube.org and save yourself a massive headache.
Who wants to get me one for a birthday present? :)