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.
Farrow and Ball Shaded White on the top units. Farrow and Ball Pigeon on the bottom unit Modern Country Style: Farrow And Ball Shaded White With Farrow And Ball Pigeon: The Perfect Modern Country Kitchen Colour Scheme?