If there's one craft material most of us have in abundance, it's cardboard. I've got two quick(ish) projects here I threw together out of corrugated cardboard.
This project came out of necessity. I have a mug on my desk at work that holds pencils, pens, scissors, etc. Then I started keeping some sugar packets and condiments in there as well, and it struck me as a potential problem. A pen dropped a little too hard on a packet of hot sauce could spell disaster. Not to mention contamination. A little bit of hot glue and duct tape turned this box into a handy second organizer for my desk.
I wanted to keep random action figures and figurines in a birdcage. But birdcages are surprisingly hard to come by. So I made my own.