Windows 7: Custom Zune Software Theme

I use the Zune software for all of my music. One of things I would love to change are the themes themselves, as they are quite dull.

There are a few it comes with, but none of them I really like. They are all a lighter color scheme, and look quite similar apart from a slightly different background.
I would prefer something darker.

So I was just curious if anyone know how to modify the existing themes to a different color scheme, not really a complete new theme.

For example, changing the existing Everglade them to a Charcoal Grey Background, with maybe a lighter grey for the background image iteself.
And Perhaps a dark Orange Font ... Something along that line.

I know little about these types of modifications and was hoping someone here copuld guide me in the right direction.

Thanks.