Darkened-water

Fill the background with black


Filter/Render/Clouds


Filter/Render/Difference Clouds


Press Ctrl+F to repeat step 3


Duplicate layer


Change top layer to screen and Filter/Artistic/Plastic Wrap…20/15/15




Change back to bottom layer and Filter/Sketch/Chrome…10/10


change top layer to Color Burn


Switch back to bottom layer and Ctrl+U and then select colorize…205/50/50




You should be left with something like