Wow, that's pretty! Personally, I am a fan of borders. I generally use 2, a narrow inner border and wider outer border. To me, it's the equivalent of adding mats to a picture frame. The picture alone can be nice, but it really stands out with the matting. Same thing with quilts.
I'd chose one of the mid to darker tones for an inner border and a lighter one for the outer border, then either the same as inner or another similar tone for binding. JMHO :)
Lay out some fabrics and audition them. It helps to decide.