I think your quilt is beautiful. Since you are asking for opinions I will add mine. I think a small inner border of one of the colors would be lovely and I think a solid dark outer border would cause the eye of the viewer to concentrate on your lovely pattern and wonderful color combination. I think a pieced border would be distracting. I would also do the binding of the same fabric as the outer border. I will be anxious to see what you do-you have lots of suggestions.