This is what I've been doing for the past 3 months. 9-foot tall tetris in the front yard. It is run on an arduino and is controlled by a playstation 2 controller. Each led is gently stuffed into a ping-pong ball and glued in place. The leds are held in place by a grid of network cables(world wide web, amirite?) which are tied to a rigid PVC pipe frame.

-160 Ping pong balls.

~300 feet of network cable

-30 feet of PVC pipe

-4x MAX7221

-9x4 feet

-price under $200

MacGyver would be proud.

Origional code by:

Kristian

If you can find my house, feel free to drop in for a game.