That looks like crazy quilting to me. Do a search on Google for crazy quilt directions. I'll see if I can find the ones I used. A couple of years ago, I was involved in a Senior Citizen group. We had a mini class; ended up making a whole quilt and raffled it off. We did the sashing in black; it was pretty neat.
I've been searching; can't find the same link I had before. Here is a good tutorial; you could use longer strips also.
http://andiejohnsonsews.blogspot.com...ilt-block.html