Genius slipper design where you knit a short "scarf", fold and sew onto your bottom. Garter stitch extra chunky yarn about wide, and however many rows you need, then sew into the 2 layers of the felt bottom.
Free Solid Granny Square crochet pattern and detail pictures of the block. Join up the squares to make a bigger project or simply use it individually. I could definitely use these for a blanket made from scrap yarn