I am working on a few ways of taking seemingly random data (static, light) and turning it into some sort of physical representation with cool colors. While looking at ways others were doing it, i found VandalSpray. Here are some pics and video.
Source: http://blog.formatlos.de/2008/12/01/digital-graffiti/

Digital Graffiti – Spray Demo from Martin Rädlinger on Vimeo.
Digital Spraycan – Early Demo from Martin Rädlinger on Vimeo.