This L sashing method use to be in the very old Workbasket magazines along with setting ideas. Not much is new anymore just rethought. LOL My favorite is to add L sashing strips, no corner stones, to side and bottom of each block. Rotate the blocks to have sashing on top of one, on bottom of the other block. The second row will be opposite. This setting adds a lot of movement to a square block quilt. I think Bonnie Hunter has this way of setting as a free pattern on her blog or use to.