Are you going to be SITD or do an all over FMQ?? I myself would ditch the sashing and the brown triangles with a matching thread. I have lots of stencils so then I would change to a cranberry outline the square and stitch a simple design inside the square. I would then match the background and use another stencil in the corners and half triangles. If you are not ready to try FMQ, then I would just crosshatch the background squares and triangles.