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How to make your desktop look cool
Build a library of cool wallpapers.
The one thing you'll be looking at the most on your desktop is the background, or wallpaper. You can use virtually any picture as your wallpaper, and there are hundreds of sites online that hosts thousands upon thousands of wallpaper images.
Pick a dozen or so that match your style and add them to your windows wallpaper slideshow. For the best-looking wallpapers, ensure that they are the same size as your desktop resolution.