Rainmeter

There are a lot of free skin packs, themes and wallpapers for Windows available on the internet, but there are only a few that provides as much functionality as well as are good-looking. Rainmeter is cool resource monitor that also provides a new skin for your Windows. This program is fully customizable and includes many skins and not only provides monitoring tools, but also gives you easy access to your RSS feeds, weather forecasts, web browser, and many more.

You can use Rainmeter as a wallpaper; in other words, you can enjoy all its benefits right on your desktop, without having to access any other application. It allows you to monitor your memory usage, disk utilization, network traffic, battery power, and all other vital information. Additionally it comes with different skins, but there are also a lot more you can download, and you can even create and add your own.