All of the methods below would require a wireless optical mouse. I will discuss possible ways of modifing this conventional mouse to a more environmentally friendly device.
A solar powered mouse is not an obvious solution to this problem. You would think an office would not provide enough energy in terms of light. I was surprised to find a product out there that puts this energy to use and unfortunately I cant take credit for this Idea. Someone came up with it before me.
"Minister Cramer of the Ministry for Housing, Spatial Planning and the Environment is taking part in a user trial of the world's first exclusively photovoltaic-powered (PV) computer mouse."
If I may say so, It is damn sexy
Unfortunately a solar panel is quite hard to integrate into a conventional mouse as there isn't much room with the batteries. A very efficient cell could be used so it doesn't have to be as large. It might also be uncomfortable to hold after the surface of the mouse has been altered.
It may be easiest to buy a relatively flat mouse and use a small solar panel, or even better, a flexible one and gluing it to the surface with resin. Many small solar panels could also be connected so that the panels lie flat.
Please comment below on any ideas you have
*Note: This instructable has no instructions and has been posted to inspire