YouTube link.
This video provides an overview of how to make an origami hang glider, and how to propel it around a room by creating a wave of air. The project apparently was developed as a teaching tool for students in school, but it is so "neat" that it should also appeal to adults. Those wishing to access detailed instructions for these hang gliders (and a wide variety of other "science toys") should visit the link below.
Science Toy Maker home page.
Preview of the finished product FIRST, THEN instructions. Nothing worse than 10 minutes listening to someone explain how to make something before you know if it's something you even want to make.