Aqua4 and Aqua9 skyboxes by Mayhem
I used Bryce 6 to create these underwater skyboxes which consist of 6 .jpg files at 1024x1024 each. Type /loadsky mayhem/aqua4 to see it in-game, or try aqua9 for a deeper underwater experience.
I was inspired by an IRC conversation and though the application of it may be limited, I decided to give it a try. This is the result. Enjoy!