That's why I like the solid blue backgrounds (or the blue gradient ones). Even as it fades, it doesn't look like total crap. Plus I think it just plain looks better than the "decorated" backgrounds.
Looking at your picture of the water changes you do, you must take out the rocks when you change the water? I thought the "framework" rocks (the bricks and shelving look) was an odd arrangement (although functional). But it looks like the rest of the rocks normally cover it up to be a more aesthetically pleasing look. You can't even see the framework now.