As many of us know, one of the most popular Lego conventions took place last month (June) in Wheeling, IL. Brickworld 2010, which took place June 17th-20th with 795 attendees, was a huge success (Or at least what I've heard and seen). And it had a fairly good sized presence of mosaics!
One such mosaic that was brought and displayed, was a Master Chief Mosaic, made by Flickr user, Jetfire35.
The mosaic is incredible because it appears to be made entirely of 1x1 tiles.
Seen below is the mosaic at Brickworld (on the left, click the image for a slightly larger size).
Although I don't have much of an interest in Halo, the mosaic is great. =)