The blocks all around the outside edges are intended for the outside border. My original thought was to put a double border between the whole and half blocks. The intention was to make it appear that you are looking down into a glass jar and the borders represent the mouth of the jar. One border would be a grayish black color and the other a blackish/whitish stripe.
When I laid it out I didn't expect to love the nice clean look of the quilt just as it is. I would only have to put a quarter of a pinwheel in the corner or piece smaller pinwheels for those corners.
I'm going to move onto another quilt while I entertain everyone's input. When you look at my quilt think about those spearmint starlight candies. That was my inspiration for the green pinwheels.