My son wanted to know how large a seam when making a rag quilt. I couldn't help him since I have never made one. Also, blocks can be any size, I presume and he was wondering if they could be rectangles and set as you would bricks. He likes to sew and was given a stack of jeans. He thought he would try making a rag quilt with them. Thanks everyone. I told him I'd find out here. Marge L.