Here is one I did some time ago. My original intent was to add lightening to the scene but I gave up as I was never able to get the lightening light to interact with the clouds. I think I will try again when I get C5 and see if the new volumetric clouds will respond to light. The water surface is a terrain with with a single fractal function layer. The texture is one I put together with much anguish and gnashing of teeth.