It looks like she made a string block with various black and white fabrics. Then cut it in four triangles and mixed them up and put them back together. Then used green sashing (or put green around every other block and on the ends of the block in between) Don't know if this makes sense but sometimes I have difficulty expressing myself. Can do it but can't say it LOL. I think you could accomplish a similar look by just using a "busy" center fabric with sashing and place them on point.