Yes, even office supplies can benefit from an eco-friendly upgrade! If you're lucky enough to have the corner office with big windows and a view, the incoming sunlight can power this sleek, wireless computer accessory from Logitech. No windows? No problem! The advanced design of this Mac-compatible keyboard even runs on light from overheads or a desk lamp. On a full battery, it'll operate for three months in total darkness (though we doubt it'll ever come to that). Available on Amazon; $58.