When practicing a new design for FMQ, I use flat sheets that I find a garage sales,thrift shops, etc. In the middle, I use old mattress covers or blankets. My family, immediate, sisters and Mom, I have asked to keep a look out for these things. I practice the new design, flip the edges over and machine bind. Usually, I remember if someone gave me the stuff and ask if they would like a throw blanket for their contribution to my practice sessions or their money back. Everyone to date has chosen the throw. I alway practice with the piece sandwiched. When I am satisfied with the design, then I quilt on something nice.