I'm still struggling with this. I wanted the pinwheels to come out from the axis (center). The only way I could do it was to fold a square in-half twice to form a triangle, much like a prairie point. But I had to add this in the middle of the half square triangle, so that meant not being able to sew two squares together 1/4 inch either side of the diagonal. I had to insert the folded triangle between the two diagonal pieces. I wonder if it's worth it. Here is my sample, but I think I need to have more contrast between the pinwheel and the outside of the block.