I just saw this on Sewing with Nancy this morning. Has anyone ever tried it? The stitch looks very heavy/thick where she echo quilted a leaf for an example. She fed one spool from one direction and the second spool from the opposite direction and threaded both threads through a topstitching needle and loosened her tension to 3 and her stitch length is 3.5. I thought it was a nice idea for setting off an area of quilting on a quilt that is asking for something a little different and special.