Blister or coin stitch tends to spread out and loosen, so I go down two needle sizes from what I would normally use to tighten it up. In the beginning things will seem too tight but trust the process! This square is made from the center outwards and can of course be made to any size. The photo model was intended as a blanket square, but with cotton yarn and it would also make a lovely dishcloth. The pattern requires yarn in two colors.