OK this is a winner, the author basically zip ties bottles to a fan, then puts ice in the bottles with holes in the top of the bottle to get air to pass by and cool.
Nice simple build. Not so sure how well it works, but if you are hot this might take the edge off.
http://www.instructables.com/id/How-to-Make-AIR-CONDITIONER-at-Home-Using-Plastic-/