Make shelves and storage options with free existing cardboard boxes. You can turn it up a notch by painting or using contact paper to decorate the boxes if you choose to spend the extra time & resources, but for me simple works just fine. Also, sometimes the graphic on the boxes can actually be quite cool by itself.
This project makes going green easy. The material is readily available (for free), the equipment is basic if any, and the labor is minimal. The finished product is durable and still recyclable; my projects shown here have lasted more than a year with moderate use, and if I ever move, I'll just recycle the boxes and save on moving expenses and gas for the moving truck (reducing my carbon footprint).
Going green is very simple with a little imagination!
Step 1: Gather supplies
Get out your handsaw or hacksaw, or anything that will allow you to cut through cardboard cleanly.