I do have to notice I've done a few from this game already - then again, it's my favorite platformer. I think there's probably a good number of people out there who can agree that SMB3 was an amazing insight into just how deep and enjoyable a game can be by combining a simple concept and gameplay with fantastic level design. Hearing some of SMB3's music remixed in the soundtrack of Super Mario Galaxy made me very, very happy.
(I must apologize for the poor photo quality. This one really doesn't compare to seeing the shirt in person, the colors are much more vibrant, and there's only so much iPhoto can do to a shot. I normally take my photos at night when there's less ambient window light, but this one was an early morning photo. At some point I'm going to make a whitebox so I can take some more decent photos, or maybe just catch a few of these shirts in use!)