Design Help Please

Hello again everyone. As I'm sure a few of you reading already know, I've been trying to give this little world of mine a much-needed overhaul. I've already cleaned up and updated my intro, plus added a new banner. Now I need to figure out what to do about the design of the world itself. My main problem is I can't figure out what to use for the background image. Right now, I have one of my older wallpapers as the image. But I think I can do something a whole lot better. So if anyone can give me some suggestions, or perhaps point me in the direction of a good image, please let me know. And before anyone asks, I'd prefer an image related to anime. Any help will be welcome.

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