I discovered a new-to-me LEGO blog called "The Luprechaun: A LEGO Universe Refugee's Outpost", and they had an interesting post about a mosaic of the faction leaders from LEGO universe.
I'd seen some pictures on flickr, but didn't have any of the backstory. Apparently it was done by model designers for the LEGO Universe program. The post on The Luprechaun includes a description of the building process by Classicsmiley, who was involved in the build. It is interesting, and I recommend checking it out.
Here's the set by Classicsmiley on flickr.