While I think of Dave Shaddix as the King of the Squiddies, he actually has completed a large amount of mosaics, too. His most recent one is a portrait of Albert Einstein:
He does, happily, also have a mosaic of Squidman:
One of my favorites is this mosaic of bowling pins on the wall of a bowling alley:
And then there is this Spock mosaic, which was autographed at the Phoenix ComicCon by Leonard Nimoy himself! How's that for combining two nerdy interests in one fell swoop?
You can find many more mosaics (including the "I Want You" mosaic that Casey previously blogged) in this set on flickr.