Just been pondering about styling a Windows Form application with Metro Controls. I can see there are a lot of costly 3rd Party controls and I'm thinking of creating a free Metro Library UI on CodePlex.
There seems to be a definitive list here. Real problem I would have would be skinning the Scrollbar at application level (Possibly could be done with Win32 Subclassing). Some controls could leverage WPF (Progress Ring, Progress Bar, Progress Intermittent Bar).
Just food for thought...