I cut strips of old, thin sheets, folded the raw edges to the inside (this makes 4 thicknesses) and crocheted with a huge plastic hook. It was my very first attempt. I increased stitches on the corners as example on internet and it turned out well. Eventually it needed to be washed so I put it in an old pillowcase and hoped for the best. I laid it on the deck rail to dry and it turned out great. Lays nice and flat.