It amazing how heavy duty some cardboard items can be. My nephew loves to make little chairs and furniture his size out of cardboard he finds in his garage.
This is a great way for him to be creative and he has come up with some pretty cool looking furniture. They aren't heavy enough for adults to use, but they are great for someone his size.
He can paint them different colors and also uses cardboard boxes to store some of his toys in. His parents have a business they run from their home, so they have access to all kinds of cardboard boxes.
He even made a large cardboard standup of himself. They traced his body on cardboard, and made it so it would stand up by itself.
My nephew then finished the piece by drawing himself on the cardboard. It wasn't as fancy as some of the professional cardboard cutouts I have seen, but he sure had fun making it.