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.
Although stairs aren't something you would think would be part of your home decor, there are ways to bring it to life! As much as I'd like a second floor, we don't have stairs, but I do have plenty of ideas for when I do!