Absolutely beautiful, nice fabric choice. As for quilting ideas I'd go for something circular in the OBW area. Those who have done a OBW will surely have great quilting ideas for you.
It is so pretty. I love the colors and the way you put the border color through the one side of the quilt. Just wonderful. Are you hooked? Do you have another in your future.
Love how you put the blocks together - there is a real flow to them. Adding the rows of diamonds is a fantastic idea. I, too, would love to see the original fabric.