I'm going to see if anyone makes a "black" screen protector. That way, you could get a black front and white back like the 3G and 3GS.
I think something like this would look neat:
http://i48.tinypic.com/5l2mmx.jpg
Minus the white home button
that will be hard though to install, because if you get it off by only a hair the front facing camera will be covered up, thus being compromised...possibly the proximity sensor too. Also, if it just happens to get over the screen that will also be compromised.
That is, of course, assuming the top and bottom will be solid black that you can't see through to make the front look black.......