I tried it and it works! I finished a top, pictures to come later, and of course, only one fabric on my stash will do for the backing. I am probably wrong, but will not admit to that. I need a backing that is 53 x 53, but only had 2 yards of the fabric. I didn't want to cut and sew back in a weird shape, so I searched for his method. I took the two yards and made a back 55 x 55 with only one diagonal seam. Loved it. For sure will use it again.