It may not be a part of the iPhone 4 Case Program but aside from helping your phone get rid of any attenuation woes, this iPhone 4G Silicone Case also comes with a solar charger. At $18.99, this case comes with a solar panel at the back, which charges the internal 1500mAh when placed in sunlight. It also comes with with LED lights in the bottom that indicate battery capacity from 25% to 100%.
via EnviroGadget