It's been a while since anyone heard from the 'yellow tag' releasers of Sonic shirts. This interesting one appeared around the fall of 2007.
Whatever company makes these, finds creative ways to use the art. Here, you can see a sort of scrambled up blocks-puzzle type of design in the background. They cut up a running Sonic and mingled it with speed lines (in cubes) to form the background. The Sonic X logo is also upside-down and reflected in water-mark style, and then as a fade near the bottom. While somewhat busy, this is still a really unique looking shirt.