My first two work studios a few years back due to low/no budget, I used to cut up used cardboard boxes and turn them into storage units. I even "faced" cabinets with them as well! It was always fun to see what your creativity can come up with.
Around 3 months ago I moved into a new work studio and i just can't help myself! I had to let myself do just one more piece of cardboard furniture to remind me of the good ol' days.