I just made 2 memory rag denim throws for a lady. I used 6 inch blocks and flannel backing and no batting. The seams are on the front and will ravel as it is washed for additional softness. The back is smooth because the seams are on the front. These were made from denim overhauls from her FIL who had passed away. We used a few flannel shirts in the flannel backing fabric. I washed at a public launder mat because I did not want the lint to mess up my home drain.