Remember your first attempts at sewing? You probably made those heavy cardboard sewing cards. On Craft Gossip’s Recycled Crafts blog, they’ve found a great way to make your own sewing cards.
Use decorative sides of tissue boxes.
Follow the instructions on the tutorial on sewing cards from The Silly Pearl.
P.S. The instructions are for Christmas-themed cards but they will work for any lightweight cardboard you can find.