The Wobbulator is a pretty nifty little video modification gadget. Basically, the idea is that by adding a couple of extra magnetic yokes at odd angles to the conventional yokes on a black and white display tube and driving them with a frequency synthesizer, you can create all kinds of amazing patterns. The results are very cool. It seems to me that a software simulation (while somewhat less cool) could still be a fun and interesting project.
Bookmarked for later consumption: