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.
Lay a strip of lace on top of your drawer. Spray-paint right over it and let it dry a bit. Remove lace from insert dresser drawer. Or spray with clear paint , trim and attach drawer pull for little girl's room.