Cardboard Furniture

I used to hang out with architects in college, and I had a passion for interior design ideas using found materials (recycling). The best of the best came out of a competition using cardboard. I toyed with cardboard some, but never have yet found the time to do much with it (but I do, of course, have ideas).

The best cardboard I've found yet is packing material around desks. Whenever a company gets new office furniture, I want to be there. The cardboard is about 1 inch thick and in a panel about 3ft x 6ft. If it could be indoors, I think it would be great building material. It's thick, durable, and best of all: FREE.