Meet the L3D Cube Kit: a 8x8x8 LED cube that you can build to put on a light show. You can choose to make it simulate fireworks or react to your music. What’s neat is the L3D cube is compatible with the Leap Motion controller and Makey Makey. The kit is fully Arduino compatible and open sourced.
The L3D cube has a stackable design. These units can communicate with each other. You can get yours here.