My test environments

Here is a cliff edge I made I wanted to test a drop off.  

Here is another test scene I made. I created a terrain using sculpt  geometry tool and applied a tubulance field to the particles I created on the plane to give it a random bumpy surface.
I was using the Maya underwater preset and adjusting it to get the underwater atmosphere.
As you can see a caustic pattern on the bottom has been created, you can see it looks generic is too geometric, without randomness and it animates too quickly.

Here is another bit of terrain created in the same way as before.
I tried applying textures to it.
Below you can see a caustic pattern I created to use instead of the preset.
With my version it is more random, less generic, can be scaled and speed adjusted.