Don't know the right name for it, (someone here does and will let you know), but there is a block that is QAYG where you make the backing block 1" larger on each side of block, assemble, quilt, then sew together. That way, you do not attach with a sashing, you just fold over the extra fabric to the front and sew down. It might be called The Fun Block? I saw it demo'd at a quilt show a couple years ago. There might be a video somewhere.