Jean-Christophe Naour, a French Interaction Designer currently based in Seoul, South Korea, recently uploaded video documentation of his Kinect Graffiti project. The result is visually striking if nothing else:
Kinect Graffiti is a digital graffiti tool using "Microsoft Kinect" camera. [The] Idea behind this project is to use the kinect to track the motion behind graffiti. Visualizing the body and drawing trough different angles in realtime, understanding surrounding space, pausing the time, etc... Kinect Graffiti is a tool built in processing & openGL, SimpleOpenNI, openNI and primeSense libraries.
The stills (via jcnaour's Flickr) look a lot like light painting / graffiti trend that's picked up with the rise of digital photography, though I'm still not quite sure how to interpret the output—i.e. whether the colors carry data or if they are purely aesthetic.
Still, I'm curious to see where this project is headed; it's something like the inverse of the Eyewriter project, which made rounds a while back...