Our challenge for week 21 is the Crossed Buttonhole Stitch - another one I have never attempted. I like it!
I'm running late this week so I've only used it in one place, but I can see all sorts of possibilities for it. I began this seam treatment with one row of ordinary buttonhole (which is showing at the bottom of the picture. Then I added another row of crossed buttonhole above that. 'Extras' include beaded flowers, french knots and daisy stitch. I used pearl cotton for the stitches.