I have 3 very" rough" quilt tops that I got at a thrift store. One is made from fabric samples. The other 2 are pieced. I have backing for them but don't want to have a lot of money in the "batting" since I will be practicing machine quilting with them. They will probably end up being car quilts or packing quilts. I was thinking of finding an inexpensive blanket or flannel sheet to use for the "batting". Does anyone have any other suggestions?