Here's the latest version. I used Google Earth to find some sort of churning coastline. Then I played with the colours to make it slightly otherworldly. Gaussian Blur on the background.

The clouds were fun. Render > Clouds doesn't give a pleasing result at this image resolution. Too "granular".. tight little clouds all bunched up... So I made a separate file with smaller dimensions. Render > Clouds. Duplicated that layer and played with the overlay to get something decent, then merged the layers and resized to the big dimensions. Selected by colour and copy /pasted into a new layer in my original image.
I'm not 100% happy with it, but I thought I'd get another round of critique before beating the dead horse some more

Game has been postponed, so I have some more time to work on the actual tower.. I'll post that soon.
Click image for larger version. 

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