Nice quilt!!! I made one of these as a Mystery Quilt with some friends but never put a border on it. I like your piano key border very much. It picks up on the colors of all the blocks. Looks like you are hand quilting this? Good for you. Don't be in a rush or worry about it taking time because when you are finished, you will have a most beautiful quilt. I also love how you are quilting it. I must remember this for when I finally quilt mine. Did I mention that you did a wonderful job on this, both piecing and quilting? Well, you did!!!