Until Apple pumps out the next-gen iPhone with integrated solar cells, we suppose Solar Arcadia's solar-powered cases are your next best option. Available in both SideFlip and Leather Flip models, the cases not only offer relatively stout protection for your handset, but they also include a solar panel in order to give your mobile a few more minutes of life while you're out and about in the sun. Each one is constructed from ABS sheepskin and is available in either red, white or black (Leather Flip is black only) motifs; not too shabby for $45.95 -- just don't expect this thing to dramatically increase your time of use.