I present to you an outstanding example of The Millionaire Mindset:
Being inventive with stuff you already have around is both thrifty and eco-conscious. (Note: this does NOT mean you should be a hoarder and collect everything in case you might possibly use it for something someday. It's merely making use of something that would otherwise be thrown away, to solve a problem you have now. If you don't have an overheating laptop, don't use this trick).
It's a great alternative to purchasing a laptop-cooling mat for $5, $10, or $30 (the prices of some such mats that I've seen).
This is a true "lifehack," in the best spirit. Gawker Media should be proud of this (and similar) posts!
Got any of your own lifehacks that you'd like to share? Leave a comment below--I'd be happy to share any other great ideas!