The pattern is called Lady of the Lake and while I think it's lovely now that it's done I think I would go insane if I made a whole quilt with this block! one thing is for sure - I learned a lot about half square triangles while making these.
If you're new to HST there are a couple of tricks that helped as I assembled these blocks:
Measure slightly larger (I rounded up from 2-7/8" to 3" for the small squares) and then trim to square after sewing the HST. Seriously, this is what saved me.
Use a scant 1/4" seam. And go slow enough to maintain that seam allowance. (This was a little bit hard for me because I like to sew fast!)