This is a really easy thing to make out of a bunch of recycled stuff. I had a bunch of extra computer fans so i decided to get some use out of them. Take a look. Sorry if this is not original.
Step 1: Materials
A computer fan (the bigger it is the more air it pushes)
A 9v battery
A 9v battery clip (thanks to the instructable on how to recycle 9vs i made my own)