Adam in America - Promotional t-shirt for AdamInAmerica.com, the website of seven guys who make random videos of themselves doing "gimmicky" things. Redesigned their logo, The Flaming Alligator Wheel.
Bad Ass Megafauna - T-shirt dedicated to the oft-forgotten huge mammals of the Paleogene and Neogene. Inspired by BBC's Walking with Beasts.
Klipspringer - Klipspringers, African mountain antelope about 2 feet high, can jump as high as 25 feet into the air to evade predators. I think that's pretty cool.