Tutorial: Bubble Quilt Method #2 | Awaiting Ada. I love this method - I'd change the squares to a 5" & 4", or 6" & 5" (instead of 6" & 4.5"). I won't hand-sew the little holes in the back, I'd layer the front and the back together and machine quilt between bubble seams. That way the layers are attached all ovet he quilt and not just at the edges. Great tutorial!