Cream curtains with a brown accent could work. Like tie backs or a vertical brown strip at the edges (also practical for keeping the curtains looking clean) Again with the seat if you like a light look keep the brown as an accent colour (its easier to remove if too much that way) a throw narrower than the seat cushion or a scatter cushion (you could have fun and have leather brown or fake fur brown for some texture. You could paint a brown square on the wall as well to frame a picture of mirror if you wanted to break up one of the walls.
Again with the throws you could do the hotel thing and have one across the bottom of the bed with a couple of scatter cushions at the head. It makes it easy to revamp the scheme without redecorating in 12 months time - like by changing brown for a rich pink or for summer a neutral cream.