This is the theme I have for FastDial on my system. I thought I'd share it with you.

The background is the popular Firefox Black by MS (kudos to them for creating such an awesome background), although I have altered it slightly. The brightness of the Firefox logo has been subdued a little bit so that the site logos will have more prominence. And I have also superimposed a flattened picture of the Earth's continents over the whole background to give it a "worldly" feel. The small screenshot might not be good enough to show this effect though.

The site logos are designed to "brighten up" when you point to them with the mouse. I have highlighted Facebook in the screenshot to give you an idea. And of course, transparent logos work best with this theme.

Enjoy!