Zetro UI Windows 7 Visual Style combines between Metro & Windows 8 interfaces.
This amazing combination gives new appearance for your Windows 7, with the elegant simple Metro interface, and the unique windows 8 borders.
you may need to check this article too Install 3rd Party Windows Themes By Using Universal Theme Patcher, VistaGlazz and UxStyle.
Zetro supports both Windows x86 & x64 and has new start menu, start orb & aero.