Yes please to rainbow stairs.
For the Home
10 Creative Ways to Paint Your Stairs: Different colors in different shades that fade into one another
Our House Is A Very, Very, Very Fine House
How to create a sunken trampoline. We had a family friend that did this with a large trampoline, it was so much fun!
Colours! Colours! Colours!
Love the colored stairs idea!
Colorful Home Decorating
15 Fun Kids Playroom Ideas From Pinterest - Baby Gizmo Blog
I'd love to use this idea for the stairs going up to the kids' bedroom/floor! Love it!!