Several people have asked about a dark panel version. I may do it sometime in the future... but no plans for now, sorry!
If you haven't tried this already, I would suggest trying Gnome Color Chooser. If you use Ubuntu, I think it's in the repositories under gnome-color-chooser. If not, try the website here:
[link]This lets you change all kinds of colors to tweak your theme. So you can make any theme have a dark panel.
Hope that helps! It's the best I can do I right now. Let me know if that works ok.
- Darin