To me, Buttonhole stitch and Blanket stitch are two different stitches. Buttonhole is the stitch I use when sewing buttonholes by hand. It has a little knot at the edge. The stitch introduced this week I call Blanket stitch, used for edges. In my samples i use both.
Above you can also see my first attempt to make lace with Buttonhole Stitch, (the white flower). Bellow is my second attempt using the same pattern with a few alterations.
The bowl bellow is made from ordinary string, covered with left over from rug weaving sewn together with Buttonhole stitch.
This week I found a fabric called “Flowers of Paradise”. I have started filling the flowers with with Fly stitch, Buttonhole stitch and Blanket stitch.
Needlepoint Lace tutorial: about making lace with Buttonhole stitch.
Google Buttonhole stitch
Google Blanket stitch