Griffin Technology has unveiled two new Griffin + Threadless cases for the iPhone 3GS and iPhone 3G, just in time for spring. The cases feature the Threadless T-shirt designs, Rainforests and Fail, and are now available at Apple retail stores nationwide.

Rainforests and Fail, like other designs selected for the Griffin + Threadless Co-Op Initiative, appear on a Griffin-engineered low-profile case. No more than a millimeter thick, a single-piece polycarbonate shell snaps into place to provide protection from dust, dings and boredom. Rainforests and Fail, $34.99, will be available April 1st at Apple Retail Stores nationwide and at .