The first seam I added was a Double Buttonhole Stitch - simple but effective.
I used blue silk to make a simple buttonhole stitch of staggered heights and then wrapped the base in red thread. Never thought of wrapping buttonhole stitch before!
This one is a Crossed Buttonhole Stitch which was a tiny bit mind bending for me.
The inspiration for all these variations came from Sarah Whittle's wonderful website - check it out! Also, you can check out the guidelines for Sharon B's Take a Stitch Tuesday (TAST) Challenge here.