Mine was scrappy with different sized strips since I didn't want to think! I cut up cheap muslin the size square i wanted and layed down the first strip right side up corner to corner on the muslin square, layed a second strip on the first strip (right sides together) and sewed a quarter inch. Flip the strip over, press with an iron or finger press, and continue to the corner. Once that side is done, do the same thing towards the other corner. Flip the whole block over and trim to size of your muslin block.