What color should I paint these two rooms in my house?

My office and living room are in need of new colors. The flooring is a sage green color with bits of brown in it. Currently the office is a light green color and the living room is a matte cream color. My furniture in the living room consists of a large black entertainment center, black book shelf, black display shelf loaded with colored glass sculpture, two purple leather chairs and a dark red leather couch. The center of the room has a large brown rug with a black square coffee table. What colors suggest mood and or appear to make the room look bigger or smaller? This house is in Portland, Oregon. The three desks in the office are made of red wood so any color can go in the room.