I use sheets all the time, both flannel and cotton. I can buy a queen sized sheet for $10 or
often less and you can't even buy a yard of quilting fabric for that in Canada. I like not having
to piece fabric for a back and often find some very unique patterned sheets. I buy them when I find a good sale and then just check my sheet stash to find a suitable back. They quilt just fine, wash and wear well.