I love what you've done so far! My suggestion for the braid - repeat a version of the feathers you did in the burgundy, cream and green border. It would 'tie' them together, rather than having each border being completely different from the rest.
The quilt top is gorgeous, one of the prettiest IRRs I've seen - it looks more like a designed quilt than an IRR, and that's why I think it would be nice to have the various borders relate to each other.
edit: I just read some more of the thread and looked at your drawings - love the alternating feathers and the dogwood-looking flowers in the covnerstones! Also, the diamonds in the stripped border.