This mosaic of the Classic Mosaic Logo was shown at ItLUG Latina 2012. It was made by Massimiliano Valentini (dogensaga).
Just look at all those minifigs!
There was also a giant mosaic of the Colosseum assembled by visitors during the event.
You can see a time-lapse video of the construction of the mosaic here.
Domenico Franco (f_Random) took photos of the event, which you can see in this set on flickr.