[aznmode]

The only real way of making it look good is by taking top half of the phone completely apart and separating the chromed plastic from the LCD and bottom pad. That would require some work. I've taken a lot of phone apart (flip phones, treos, mogul) but the TP just by the looks of it, isn't going to be easy. You can then sand and paint the chrome bezel. Then you have to put it back together.

The cheaper/faster way would be to mask the LCD and bottom pad. Unless you have some experience in this then you will not get a good result.

If the chip is that obvious (I'm assuming its a darker plastic under), you can buy a metallic chrome spray paint, spray some paint in a small container and use a tiny brush and paint over the scratch. It won't look exact but atleast it will conseal the off color.