5 Magical DIY Ideas Using Harry Potter-Themed Fabric 1. DIY Hogwarts House Scarf A timeless classic for any Harry Potter fan! Use our Hogwarts print or combine cotton poplin fabrics in house colours — like red and gold for Gryffindor or green and silver for Slytherin — to create cosy scarves. They're easy to sew and perfect for beginners. Tip...