Week 3 TAST (take a stitch Tuesday with Sharon) is the feather stitch.
I used it to fill a triangle.
I've used this one before on temari to make sea weed for my Goldfish.
Week 4 - The cretan stitch is totally new to me. It's just a little change on the stitches we've done so far - buttonhole, fly, and feather. I stitched a single line with bright green thread and then tried filling a couple of adjacent triangles. Pretty cool!