Home decor sites are full of gorgeously painted staircases, in a rainbow of colors. If you're not ready to commit to a whole staircase, however, you may want to consider a colorful banister or balustrade. They're a bit more understated, and every bit as pretty. 

  1. A brightly painted balustrade turns this staircase into a cheerful focal point. From Midwestern Living
  2. The subtle silver of this handrail picks up the silver frames lining the staircase in this photo from House To Home.  
  3. Preppy orange and geometric shapes look modern and chic. From Pomegranate Inc via The Pursuit of Style
  4. A pale, grayish-blue shows off the architecture of this Edwardian-era home in San Francisco, designed by Three Legged Pig
  5. A dark gray banister and treads compliment the striped rug and botanical wallpaper in a home by Sage Design Studio

(Images: As linked above.)