In a few simple steps Carol Duvall makes this table, which is four feet high, with a circular top four feet wide.
"heavy corrugated cardboard cut to the following dimensions:
4' X 4' for tabletop
two 4' X 3 1/2' for legs
Here are the steps how to make it: Link.
This chair can withstand an adult's weight quite easily even without using lamination. "The corrugated cardboard construction has a warmth and softness not obtained from wood".
Here is a brief guide & photographs that describes how to make a chair, & a diagram of how to cut out the parts.
How about kids making some cardboard furniture? Here is this site, which will be of help: foldschool, it has downloadable patterns to get you started. But do remember to help the kids with the cutting of some cardboard & all.
There is this coffee table "Chubb" coffee table. "The top is four sheets cross-glued, with the bottom two sheets cut out for the legs. It's stable enough for me to sit on! I designed it to go with the low sofa/futon we bought, but once put together, it reminds me of those traditional chabu-dai (low, portable dining tables for small meals) I used to see on television dramas in Japan".
More details: Link.
Creative Business Cards.
Houses With A Difference.
Creativity With Newspaper.
Interesting Furniture, Part - 2.