In the past few years, we have covered a bunch of cool 3D LED cubes that you can buy to put on a light show. The LETOO 16 x 16 x 16 3D LED Cube is an electronics kit that can teach you a thing or two as you put it together. It comes with 4096 red, green, and blue LED nodes.
You can try 20 different animation effects. The companion PC software lets you make new patterns with your mouse.