Charming

So here is the pcs of my son's quilt for his graduation. I need all of your wonderful people to think with me what is the best scenario for a border. Just plain green and black or braid (will that be too much?). There was too much green for my eyes to work with and i can't wait to be over with this but my dear son loves these colors :) and i want it to be perfect and i don't care if it is gonna take me long time to finish.
Thank you all for your usual help and support.

Faten