An obvious system that uses the energy around it is the grass on your lawn. It utilizes the most plentiful source of energy in our solar system; the sun.
However, unless you have an extremely efficient solar cell, you are unlikely to get a large boost of energy for you bike through a direct means.
You could perhaps use an electric motor powered by a rechargeable battery to help drive your bike, and then use solar or wind power to recharge the battery when it is not in use.