If you're a little crafty, you can make this
balloon-powered papercraft hovercraft!
Download + build your own simple papercraft balloon-powered hovercraft! (by Okayama Prefectural Tamano High School; you'll need some other materials too)
http://www.tamano.okayama-c.ed.jp/seikatu/bukatu_b/science.html
(click the four light blue links in the "活動記録/成績" text block)
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