As a proud Blue Peter badge holder (prior to the ebay badge debacle), I was impressed to see a new concept for environmentally friendly flat-pack furniture constructed from 99% 'post-consumer recycled paper'. According to the overview of the zBoard on the Way Basics web site, the structure of the panels look like a cross between structured cardboard and particle board, although they are neither. You attach the panels together, not using allen keys, but using something the team on Blue Peter would know all about - double-sided sticky tape!
Interesting idea. Very environmentally friendly, and very customizable. Prices start at around $20 for Way Basics furniture at Amazon.com