The Personalization Gallery is the website created by Microsoft to get free wallpapers and themes. There many categories to choose from and you can get them from Microsoft in high resolution format without any charge.
A theme is a group of pictures, colors, and sounds combines together for customizing and personalizing your PC. The new version Windows (7 and 8) has new exciting desktop customization features.
The personalizing gallery also includes collection of desktop wallpaper which makes it easier to keep your Computer in balanced with your taste. You just need to browse different categories and check out these selection of free images. Get one you like, and save it - from natural wonders to a masterpiece works of art.