grab some square pieces of cardboard for the 3D base. Then, follow along as we mark and cut out the shapes. It's super easy, we promise! Next up, it's decorating time! Let's use colorful paper to ...

here’s one thing you can do with all those pieces that are too small to use for anything else– chuck them in an old blender, whip up some cardboard pulp, and press that gunk into some 3D ...