This build is interesting since the author has a re-usable cooling source, popicles in plastic. Why? Well the fan does the standard stuff of blowing on the ice, and out comes the cool air from the bottom (instead of the top as you typically find). This is done since the popicles, when melted wont leave a bit puddle at the bottom of the bucket, so you can get more “cool air” from the bottom. Nice build, but I prefer something that could handle straight ice myself.
http://www.instructables.com/id/5-Gallon-Bucket-Air-Conditioner/