How to use Visual Studio 11 Dark Theme on my own WPF application?

I actually was just looking for the same thing for the WPF app that I am working on. I couldn't find one but did find a VS 2012 Metro Style Theme.

Someone posted it here : VS Theme

If you want a wpf / xaml dark theme or dark mode (or any other color), use the MahApps.Metro UI toolkit. It replaces a lot of the default WPF controls with Metro styled ones that you can give all sorts of custom colors and themes.