Glass. Colored cobalt, red, umber, given that it will work with your furniture once in place.

Beautiful room. I would add items that are repeated in color and consistent in style. Any color will work with the copper color; it's more important items tie into your furniture and accessories. You could also just go with books and silver framed photos and black and white prints. I would paint the one narrow opening above TV grey.

Hi! Here are a few ideas for you:

http://deciture.com/abrielle-ceramic-lidded-jars-set-of-3/

http://deciture.com/arlington-wood-lanterns-set-of-2/

http://deciture.com/bird-and-branch-with-hanging-clock/

http://deciture.com/cki-relief-red-hopkins-short-bottle/