I haven't done it. I'm thinking of doing it though. Basically you create a macbook pro stand, with either whole surface of peltier elements or just the hottest areas. You put a small fan underneath the elements so you don't get too much heat on the bottom side... Could this actually benefit cooling versus commercial "big fan" designs? Basically you end up with a constantly cool laptop desk, it probably wouldn't consume that much power to get it to 15 or so degrees. I have a few at home and they get freezing cold. I have no idea what kind of impact would it have... 4cm*4cm elements are cheap, about 0.99c on eBay.