We love this: Give away the plans; find your own materials.
Foldschool is a collection of free cardboard furniture for kids, handmade by you. The downloadable patterns can be printed out with any printer. Follow the instructions and assemble a stable piece of furniture.
And it gets better, with a mission statement worth reading:
Mass culture is run by superficiality and ecological absurdity. Foldschool supports craftsmanship as a face-to-face approach to design and brings together product and user the closest possible. The mindset of foldschool is to restore design to one of its original missions: to provide a product at an affordable price through a smart manufacturing process.