How to install Windows 8 modern (metro) UI on XP, Vista, or 7

Rainmeter is a freeware customization software package for Windows XP, Vista, 7, and 8 that allows you to do just that. It’s a nice customization tool that has plenty of options, and you can download it from this website.
                              Download Rainmeter
Once you have installed Rainmeter, you’ll need a suitable skin. Omnimo UI is a Rainmeter skin inspired by Metro UI which