Awesome Update: "Anonymous" posted David Bromstad's actual technique video with the 'how to' for this project. Thank you Anonymous!!! :) Here's the link: http://www.hgtv.com/video/celebrity-art-project-video/index.html
I thought it was pretty clever so I made a painting using this technique.
Try out this out, but be prepared to catch the dripping water and paint with something besides your carpet!