Plus, the fish have to have something to swim around. It may appear like a static background, but there is actually a lot of 3D geometry in there which puts the shadows/lightplay in the correct places and gives the fish something to swim around. Press W (wireframe) to see what's up. I think creating a new background is beyond the ability of 99.7% of users and we've seen some of the ugliness that the other .3% create when given free rein to modify.
"Journalism is printing what someone else does not want printed. Everything else is public relations." - George Orwell
"If voting changed anything, they'd make it illegal." - Emma Goldman
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