Go green! How many times have you come across this phrase? If you do intend to take up the cause of protecting your environment seriously, and want to do it in style, then check out the Cannondale OnBike bicycles. The bike features a fully enclosed drivetrain and a custom SRAM i-MOTION 9-speed hub gear along with disc brakes. The frame is handcrafted with aluminum and the bike is finished with Octopus pedals and Schwalbe Kojak Bad Boy tires. With only 250 pieces on sale, these limited edition bikes would cost you $6,150 apiece.