What components do I need to build a Metro-style app in WPF?

What I think is a good solution, is to take the original Metro Styles of the Windows Phone 7 and ajust them that they fit Windows requirements.

A good one to start with is the LightBlue Style which can be found here:

C:\Program Files (x86)\Microsoft SDKs\Windows Phone\v7.0\Design

And I found an other promissing framework on codeplex. http://metrotoolkit.codeplex.com/ (But I did not check it out until now.)

You can use Elysium, which licensed under MIT license and included ApplicationBar and ToastNotification classes.