Installation No.1 for Pure Data and Gem uses the bonk object to trigger colored graphics. The bonks or sounds the more colored lines appear and the larger they get. The lines are created using the particle objects. The installation is designed to be in a large space where it can soak up the ambient sounds and translate them into these colored lines.

I really like this one. Maybe I could do something similar...not as complicated thought.   

Author: David Dean Mendoza http://www.daviddeanmendoza.com/

http://www.youtube.com/watch?v=DT6KWG0eqMg&feature=related