Awesome idea:birthday party decor,take diffrent color table cloths and tape them to to ceiling like that. Then tie 3 diffrent color balloons together and tape them to another set of balloons then tape the all the balloons in the middle of the table cloth.
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.