My friend Steve and his family did a fun project for Halloween using a pumpkin, LEDs, and a project board from Arduino. While it’s too late for Halloween this year, it’s not too late to get a board and start your own project for Christmas or get a super early start for next Halloween.
You can find a fantastic walkthrough video on his web site, and you can also find there the source for the Cylon bouncer program.
What’s an Arduino board? It’s a tiny, inexpensive circuit board with an easy software development kit that you can use for all sorts of projects. You can learn more on Gadget Lab.