It looks like an uneven nine patch with a square next to it, then a nine patch, etc. The 9 patch is scrap pieced in places and the square next to it is strip/scrap pieced. I have seen the 9 patch several times, but do not know the name of it.
I see Maniacquilter shows an example. If you use only the center block and then alternate with a "solid" square, you will have the pattern.
Last edited by yngldy; 10-16-2015 at 06:01 AM.