Spicing up iPhone's black background

I was wondering why the Home view on the iPhone features a flat black background. It saves battery, I suppose, but it's also a little boring. Here are some quick mock-ups of what it would look like with background images.

Click for full-size.

Nice, but feels like bastardized Mac OS X.



Colorful, but too busy.



Way too busy.

I actually prefer the black. Can you do better?

All images here are Apple's. No hard feelings?