Dr. McNinja created the Warrior Plumbers t-shirt to honor the Romulus and Remus of the video game universe, Mario Mario and Luigi Mario. On it, Mario lays waste to a Koopa Troopa with a fireball to the face, Yoshi slavers over some fleeing Goombas, and Luigi rises like the Phoenix from a tube just in time to clock a Piranha Plant.
Topatoco is actually a pretty brilliant little site. It amalgamates all the schwag from a pool of pretty stellar web comics and then sells it to both you and me. I’ve got a few other things from them, but probably the best one is the Map of Compromise.