How to Make Cardboard Furniture
Corrugated cardboard is a cheap, light and rather resistant material. It is quite appropriate to make small furniture pieces as long as they have a clever structure design and are kept perfectly dry, and far from a heat source.
Links to cardboard furniture designs
http://foldschool.com/: free patterns for a stool, a chair, and a rocker for kids [www.designboom.com/cardboard3.html www.designboom.com]