Here is a rendered scene of an underwater environment, as you can see when aspect such as texturing, lighting and rendering are put together successfully it does really work wonders! I hope to achieve an environment like this but in a much bigger scale.
I like this video but I think there's way too much going on
the video above is interesting in terms of particles, it makes it really magical when the particles shine in colourful lights. I believe that it might be too much at times and a bit more variation would be good.