10/10 would buy it as a screensaver! It has been years since I saw a cool screensaver that is just fun to watch when I am not doing stuff.
[edit] There is a screensaver and it works! http://code.google.com/p/pixelcity/
I generally use videos as a screensaver, it allows me to have pretty cool screensavers fast. I use xsecurelock [0] with the saver_mplayer backend, which means that when I lock the screen, xsecurelock runs the videos in my ~/Videos directory on repeat.
I couple that with something like the Iron Man schematics videos made by Territory Studio [1] and I've got myself a pretty rad looking screensaver (with minimal effort).
[0] https://github.com/google/xsecurelock
[1] https://www.behance.net/gallery/26009421/AVENGERS-Age-of-Ult...