Okay,First Check the original scan , Click! and please Full View the wallpaper.
I really love that scan,It looks lovely and fantastic so that I desided to make a wallpaper outta it.
Well,I searched for different aqua textures from google and deviantart. I mixed them and I tried to make the colors look sorta shiny on the surface 'cause I wanted them seem like the sun rays are coming in,and I made the colors deeper below.
I added algae,bubbles and water reflection brushes.And I played with their blending options many times till I reached this result.
After that I changed the whole wallpaper's colors and made it darker.
P.S. I added many textures on the scan after I extracted it that's why it looks like this, It has good quality anyways.
Oh yeah,The quote is written by my sister btw.And I chose the title 'cause it suits the quote and the scene.

Textless Version