Im thinking along the lines of coral reefs or ship wrecks, I have looked on sites like opengameart.org and openclipart but there aren't many to choose from.
Any suggestions would be appreciated.
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I really don't mean this to be a self promotion, but I've been compiling a list of resources for game devs. I honestly can't remember if there is anything like that or not but you could click through graphics links and see.
http://kurie.us/game-developers-resource-list/
Pixel Prospector also has another really great compilation as well. Might be worth a dig through to see if there is anything there to.
http://www.pixelprospector.com/indie-resources/
At any rate, if you find something like that, let me know please.
Thanks for the reply ill check out the links now, much appreciated!