I outlined the yellow pinwheels with eggshell colored thread. I did a triangular/geometric meander in eggshell colored thread in the white triangles. In the red triangles I did a geometric meander in a scarlet colored thread. In the blue pinwheels I did a ribbon in navy blue colored thread. You can't really see it in any of the pictures, but the border is green, and I did the same geometric meander from the red triangles in the green border, in a green thread.