If you go to a poundland esque shop (there bloody everwhere) you can get a USB fan (you guessed it yup, there £1!) that you can rest laptop onto, it will keep the laptop off a solid surface, and also keep it cool by blowing cool air through onto the components, I swear by them now as you can stay on laptop for hours on end and not worry about overheating!.
I hope this helps.