Here is a picture of my license plate cover that I did this afternoon. Sorry if the image is too big. I forgot to reduce the image size on my camera.
Personally, I think it looks great. It was MUCH easier to coat this cover than the plate itself. I was worried that I would have a running problem due to the curvature of this cover but it was fine. I used a light coat on both front and back.
Here's a smaller image for dial-up users: