If you want to pull some of your bathroom color into your bedroom, you might want to look into teal or mint. Both will work with your brown furniture. I would not suggest adding the black ( from the bath) into the bedroom with the brown and teal ( or mint).

Here are some inspiration photos so that you can see how mint paint works with brown furniture - liking the white or off white (linen color) head boards and linens:

You can always match the mint in the bathroom in a paint .

If you don't want mint walls here are some other ideas:

I suggest a pale color that is so close to a blue or green, that you cant tell which one it is. White sheers over a blind.

Thanks, never thought of mint bedding.