This site has downloadable patterns for creating paper car models. Although it is in japanese it isn't too hard to figure out and yes they have a Prius... http://art66.hp.infoseek.co.jp/
There is also one in PDF form that was posted somewhere on this board but I cant find it now. I'll just post a link to my page that has a colored version and black and white version. It also has instructions if you can read Japanese. The pictures are pretty clear on what to do. Prius Origami
