How about adding binding with a flange (accent strip) You can google Susies Magic Binding for a photo tutorial or watch the video at this link...
http://www.52quilts.com/2015/02/susi...-tutorial.html
I have used this binding method. The binding is done all by machine. I like your dark border. By adding the flange (a tiny strip of color ) beside a dark binding would tie the quilt together. Good luck! Your quilt is lovely!