add wood wallpaper to the kick plates of the stairs. Those rolls are expensive but you would only need one. Not practical with white treads though, it will be stuffed up from black shoe soles in no time.
Great color combination: We love the modest green wall of this living room. It's a perfect match to the comfortable grey couch with a bunch of pillows and this neutral carpet. Great eyecatcher: a beautiful lamp in shape of a light bulb and a white RAR roc