Trust me you do not need a pattern for this. If you're using a jelly roll cut in 2 1/2" strips, then you would sub cut into 6 1/2" strips. Sewing three together gives you a 6 1/2" square. Your sashing would have four strips cut at 6 1/2" with four 2 1/2" squares for the cornerstones. If this is as clear as mud PM me and I'll try to explain better. This was the first quilt my GD made without a pattern.