Great way to add depth and color to any area. Use green crepe paper. Attach paper to the base of the wall. Twist paper and cut in varying angles. Add colorful ocean art items to complete the scene. cokesburyvbs.com
I created a fish stencil and cut out a bunch of fish from ivory, gray, and blue felt. I then attached them to the wall with poster strips. I had them curve around so it looked like they were swimming in the ocean.