I want to keep my hands warm(er) while working on a laptop in a cold room. Would it make sense to take a polar fleece blanket, fold it in half, sew together the two edges that are perpendicular to the fold, cut a slot in the middle two thirds of the fold, use it to create a sort of "enclosure" covering hands, mouse and keyboard with an open slot facing me?
Same question with one of those hot/cold insulated shopping bags, or other similar things.