I recently used that technique, self-binding I think it's called, for a basic quiltlet made from a single piece of flannel on each side which was tied instead of quilted. It looks fine, and it was wonderfully easy to do, but I do worry a bit about how sturdy it is. In this case it was flannel, which I'd hope is thick enough, but is self-binding a good idea in general when you're using a quilting cotton on the back?