Experimental Gameplay Project Apparel
The
Experimental Gameplay Project
(EGP) started as a student project for game design at Carnegie Mellon
University. Originally, the games submitted to the project had to be completed
in seven days by one person, and had to be based around a central theme like
gravity or color. Since then, it has grown to be a hub and a home for
independent game developers. Anybody with a game prototype can post it on the
website to share it with the gaming community, and maybe even get a licensing
deal.
Well, somebody had the rad idea to make t-shirts themed after some of EGP's most creative games, and package the t-shirt with that video game. EGP Apparel's website is still under construction, but I got my Tri-Achnid (by Edmund McMillen) shirt at Target. I'll let you know when there's a more viable way of getting shirts.

I seriously can't find images of these tshirts, so here's
screens of Tri-Achnid and DeBlob, two EGP games and shirts.