An LED matrix installed in a real pumpkin ... creating a net of black wiring. Above you can see it turned out great. This is a shot of it scrolling the message HAPPY HALLOWEEN.

Everyone loves LED matrices, and even if you can’t find what you like commercially, it’s pretty easy to make just what you want. Need it big? No problem; just order a big PCB and some WS2812s.

"Our new IS31FL3758 matrix LED driver represents a significant leap forward in LED ... Other products include audio, sensors, high-speed wire communications, optical networking, and application ...