Case Mate has released limited edition spring colors for the Tank Case and the Pop! With Stand Case for iPhone 4 and iPhone 4s just in time for the snow melting in the Northern Hemisphere. The Tank Case is a rugged, military grade iPhone 4/4s case available for $60 USD and the Pop! With Stand Case is hard shelled, soft interior case with a kick stand allowing for multiple viewing angles that can be purchased for $40 USD. No word on how long these colors will be available.