I just finished a batik quilt made from not quite 10" squares. I used black in my sashing and it looks fantastic. Your quilt is really bright and so pretty, you did a great job on this quilt. Personally, I would use the same black for the border that you used in your quilt. I never liked batiks for several years after they first came out, but now I am a convert. I just bought 8 batik FQ's yesterday and wish I had bought more of them. Your quilt is so colorful, thanks for showing.