Metro UI is sure a fresh concept for modern intuitive User interaction. Luckily enough, you can get Windows 8 Metro UI on Windows 7, thanks to Metro7 app.
Metro 7 provides instant access to built-in widgets and a custom store from where you can install more applications. Obviously, these are not same as native Windows 8 apps, but they are pretty close.
The tiles provide time and date information, access to built-in metro store, weather application, and shortcuts to numerous websites like Facebook and Badoo. You can go ahead and customize it to your needs.
Overall, Metro7 is a good application for emulating the Windows 8 MetroUI style interface on your Windows 7 desktop, however, it still seems to be under construction as some of the widgets simply lead to a blank page and many of the website shortcuts on the main interface seem to be there to fill the main interface. Metro 7 has been developed for Windows 7.