Here's an interesting design that uses the "Sonic X" title and also the actual copyright information (!) as a design feature! Repated over and over again in the logo sihlouette face, the words form the pattern.

What does the info say? "Produced by Hi Kids Published by Rose Video" Again here, they've added the logo to the back of the shirt for a touch of class.

As is common for whatever comapny is doing these, here's a varient color, this time with red. The logo on the back of this one is the same. Interestingly, on this one the "Sonic X" word fades from whitish to yellowish.