How to Make Cardboard Furniture
From Howtopedia - english
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]
If you haven't the time or resources to construct your own, some compagnies sell ready made products & toys:
www.villagegreenproducts.co.uk
www.cardboardtoys.com