When I was little (about 20 years ago) I found a website where you could download sheets to print out. They contained parts to cut out that would make an elaborate little glider airplane. You layered multiple layers of paper together and glued them. It included many different parts, but all of them were just paper in the end of the day.

I think the site is gone, I can't find it anymore. It had a blue background and about 10-20 designs available for download. It was either German, Swiss, Austrian, Italian or French, but I'm pretty sure it had multiple Languages.

Anyways, I found something very similar: http://www.zovirl.com/paper-airplanes/