Very nice quilt.
I have one sitting waiting to be sandwiched and quilted, and I think I am doing to do the shadows with straight lines -- in the ditch on both sides and probably 2 lines. I am going to quilt something different in each of the squares -- stippling in one, figure 8's in another, loops in another, etc. etc. For the light sashing strips - I thought that I'd just leave them unquilted, or perhaps a long wavy line. For the borders, don't quite know yet. I think it will depend on what is working well for me at the time.
I'll be watching for other suggestions, and perhaps change my whole plan.
Aileen