I love blue and dark brown and white together. I did it to my dining room but in a beachy theme. And the colors look really good together. I would do a comforter in shades of blue. And maybe a rug in brown n blue. Or something with these shades to pull it all together. Framed art on the wall with think frames in a deep wooden color and maybe a mirror

Just to show u the colors

Cool shades - greys, blues - would offset the dark, warm tones nicely, but you might use any light to midtone colours you like as accent here. May I suggest you paint the walls in an accent shade, so that your bed stands out more? It is also nice when the accent rug allows you walk in bare feet around the bed, which would mean a minimum 2' border beyond the bedframe sides, ( much more than that, and you will hit the wall, anyway), and a generous amount showing at the end of the bed.