I just finished one and did the serpentine stitch down each seam and I also stitched each in the opposite direction. It went together quickly and looks good! Last year I made Christmas ones for my 2 sisters and this one was of Halloween fabric and went to my brother and SIL. SIL was thrilled and threatened not to share
Here it is before I quilted it. I goofed and didn't do the 45 angle on the ends but the size is still great for a lap/sofa quilt