Well, the answer is obvious. Cardboard furniture.
This particular piece was a tedious nightmare. I am not a very clever man, and after finishing it I realized I probably should have used a pattern. But oh-well, here it is!
Step 1: Materials!
A box cutter
Cardboard (I used one good sized box for most of it)
A marker (or pen)
And something to chew or suck on, it's not required, but it's a nice touch.
Step 2: First Step: Cutting the Cardboard
Then you simply notch slots into the sheets (they should end in the middle of the piece) to insert the cross sections pieces. This is where a pattern would come in hand. However, again, I am not a clever man, and I did each one-by-one without a pattern.
Don't do what I did. Be a clever man. Make a pattern.
The cross section pieces are the other six cardboard sheets. Notch these as well in the middle. This way, when you assemble the pieces fit nicely together.
Step 3: Assembling
Step 4: Leg
But I made a leg so it would be a little taller.
This leg is compromised of six 11x4" cardboard pieces with five reinforcing pieces of 12x2".
In this picture there is only one reinforcing piece at the top, however, I would recommend using three.