If you ran out and bought neon duct tape after our things to do with a cardboard box post, you’ll be pleased to know we have yet another use for it! This interlocking cardboard castle is a perfect activity for cold winter evenings. The whole thing is just duct tape and cardboard, and the tape makes the finished piece pretty hardy. You can download the template, and get full instructions over on Mer Mag. If you’re not used to working with duct tape, make sure you also read the How to Cut Duct Tape for Craft Projects post too. Love it.