Superstar
Just when you thought you had seen it all in the world of bicycle design, a team of Korean designers goes and creates the +Alpha concept bike. Designers Ki Seung Lee, Ho Jun Shin and Doo Youl have designed a bike that harnesses the sun's energy by folding up into a box covered in photovoltaic panels.

The +Alpha concept bike is covered in photovoltaic panels on one side, which absorbs solar power during the day to help give you that extra push when biking up hills or racing down straightaways. The solar power gathered by the +Alpha concept bike can also be used to charge gadgets -- a feature which today's eco-friendly geeks should find especially useful. The +Alpha concept bike is ideal for those who love to ride their bikes, but wish that the two-wheelers did a little bit more than take up space when not in use.