One of the above two shirts designs from illustrator Omnitarian will be sold through Fangamer, the Earthbound (or Mother, as it's known in Japan) merchandise shop run by the same people behind the dedicated Starmen.net community.

The piece on the right depicts a friendly salutation between Carbon Dog and Diamond Dog, the two forms for the guardian of Earthbound's Fire Spring. The Diamond Dog is considered one of the most difficult bosses in the game, due to his ability to "diamondize" party members with a single bite.

The other shirt, "Pandora's Happy Box", has a mob of enemies from Mother 3 (Earthbound's sequel), like the Cattlesnake and Zombie Dog, spilling out of a television.

The Fangamer forum is currently voting for which shirt will be printed and sold, and the two are pretty even at the time of this posting. Here are larger images of the artwork, each with two color variations: