Changing Today Background Color in WM5

[Guest The Almighty Sam]

Okay, I came up with another question, an elementary one I'm sure. On the Today screen, if you set the transparency of the background image to say 50%, it becomes lighter, as though there's a layer of white underneath. Is there a way to change the background color underneath the image to, say, black, or another color? Otherwise, it seems the transparency setting only serves to make the Today screen text harder to read.

Thanks!