I think, in retrospect, that a crocheted edge all around would have worked, but not blanket stitch.I also decided that the ends did need blanket stitching, but a closed, rather than open blanket stitch to reflect the points of the main design.
Having decided that, I set about finishing off the back. Although the aim in Swedish weaving is to use a thread long enough to go from one side to the other of the blanket (so some thread is 3.5 times the width of the throw!), there were a number of occasions where this didn't work out, and I was not flush with thread, so figured I could join threads using a technique I learned in a Naversom class late last year (still haven't finished my blog on that - but will get to it).
You leave two tails on the back, then stitch them together with machine thread of a similar colour, gently securing the joined threads to the back of the fabric. On such loose weave fabric it does need to be secured, or it will catch, but the technique seems to have worked fine. I finished the sides with a machine hem 4 threads wide.
This photo, by the way, is taken using the clip-on attachment to my iPhone that Jim bought me for my birthday. It is an amazing micro lens, and also has a wide-angle and a fish-eye lens. Really simple to use and great quality.
I dug out my huck handtowel - made as my first school sewing project when I was 7 or 8 years old to compare. It was much used in my home when I was a child, so has quite a few stains.