The Shiro SQ-S MP3 player has a handily placed solar-powered battery on the back of the device, allowing the player to be constantly charging, even as you use it. Pretty clever idea.

The solar cell tree charger by Vivien Mullar is a concept USB charger that pays homage to the environment twice. First by being in the shape of a futuristic tree and then by using solar energy to charge all your household gadgets. Everyone’s a winner.