This is one of my favourite affects

1. First make a new picture with File > New.

2. Make the background layer black

3. Create a new layer, color it black



4. On the color picker, color the foreground white and the background black



5. Go to Filter > Render > Difference clouds. [Ctrl + F will make it more detailed]



6. Then go to Filter > Sketch > Chrome.



7. To give the water a nice color, Make a new layer [Ctrl + Shift + N]

8. Change the opacity




this is another SG product ;-)