Many thanks! This has been so helpful for me. OK - rust it is. I've already cut the sashing strips, so I need to use cornerstones. Plus I can't visualize the triple sashing without them. As I said, I'm colour and design challenged! Now to figure out a thin inner border to separate the rust cornerstones from the rust border. I might use a deeper blue as it is opposite orange on the colour wheel, and the rust is kind of orang-y. I'll post a pic in the pictures section when I'm done.