Well here’s an interesting idea- an optical mouse with a solar panel on top. It makes sense since most mice run on relatively low power these days and sit unused for long enough to get a full charge just from the ambient light in the room. This mouse does have the option of running on a single AAA battery if you’re living in a cave, with a vampire roommate, or in Alaska during the Winter (or all 3 of those at once, which is my next idea for a movie entitled “Cold Dark Days”). Available for $36 from Brando.
Genuine Dell 9RRC7 Black Optical USB Wired 3-Button Plug & Play Mouse With Scroll Wheel, Compatible Dell Part Numbers: 356WK, 5Y2RG, 11D3V, MS111-P, 330-9456
Solar Charger, Brolar 5000mAH Portable Power Bank for iPhone, iPad, Android, Cell Phone, Tablet. Waterproof, DustProof, ShockProof, Portable Charger with Dual USB Port