I make my bed runners double sided, but without batt, don't need the warmth or weight. That said, even that quilting has some dimension which pleases me. Quilting stitches after all are all about the play of light on our work.
I use very thin batt, currently Hobbs Thermore, ultra thin, and it can be split in half from that. Less room taken when stored, and I like to layer quilts on the bed when cold, as opposed to one thick quilt. So I guess in my current incarnation my quilts are flatish. Which doesn't get into ironing seams open so you start flat in the first place
