Old cardboard boxes are easily recyclable, but they can also be used to make festive ornaments for your holiday Christmas tree. Cut out gingerbread men from old cardboard boxes, and “frost” them using puffy paint from any craft supply store. Allow the ornaments to dry, punch a hole at the top and run a piece of string through it. This is a fun eco-craft project to do with kids. The best part? The ornaments can be saved and hung year after year on the Christmas tree.