DIY - Glow in the dark pots with mums for fall/Halloween. Buy a flower pot that you really like and use Rustoleum's Glow-in-the-dark paint to paint the pot. During the day, the paint will absorb the sunlight and at night the pots will glow.
Corian® cantilevered staircase LUXO SURFACES - OFFICINE SANDRINI Tg: concerned glare at eye level or above. Solution turn steps on a few at a time on the way up, but could give good contrast on the way down
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.