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.
AULA 2016-S Rainbow LED Backlit Gaming Keyboard & Mouse Combo with Pro-Gaming Mousepad Included (Black Color)