Want to paint walls and ceiling as if you were underwater.?

want to blend two colors with an underwater feel. Would also like include the ceiling. Was thinking that more than two colors should be usedWant to paint walls and ceiling as if you were underwater.?
blue white gray.Want to paint walls and ceiling as if you were underwater.?
very pale turquoise blending gradually to a dark blue. Easy to do with an airless paint gun, which would require rental from a tool rental center and some practice to get the technique down!
I think different shades of blue would be nice, graduate to a darker purple tint for the deeper parts of the water and a lighter blue with some white blended in the area that would be the water surface. Maybe use a ripple effect on the water surface with white paint or a type of textured or metallic paint.
start light blueish/greanish and get dark green/blue

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