The strict Metro UI apps are Windows 8 only, and they require WinRT.
But if you want to simulate the Metro style in Windows 7 and Windows Forms, you can use FIVEWIN controls (or develop your own),
From the developer tools I know only FIVEWIN offers this complete set of controls already.
Regards,
Otto
Controls included in the FIVEWIN:
Combo8
Flatbtn
CP
MetroCP
Switch
GridView xBrowse
Buttons
DropDown and List
Calendar
MultiColumnCombo
PageView
Panels and Labels
ListView
Property Grid
RibbonBar
Forms and Dialogs