dexim offers the P-Flip DCA223 foldable solar power charger for iPhone 4. Instead of an adapter, the DCA223 comes as a foldable stand with two camouflage-colored solar panels that convert the sun’s rays into juice for your iPhone. It takes around 15 hours of exposure to natural sunlight to fully charge the internal 2000mAh Lithium Polymer battery or simply use the included cable.
The P-Flip DCA223 also serves as a foldable dock for charging and syncing iPhone 4. It is priced at $79.9.