It's called Bliss. That's the dreamy pasture scene that serves as the default desktop background for Windows XP. But you're not a Microsoft drone, are you? You see the desktop background as a canvas on which you will let the world know something about you. This is your opportunity for personal expression. So whether it's a favorite movie poster, a NASCAR driver, or a picture of the dog or the grandkids, if it's in a digital format, you can use it as the desktop background.
Here's how to change your background:
And there's an even easier way: if you want to use one of your own pictures, there's a shortcut available that prevents you from having to go through the steps above. Just browse to the desired picture using Windows Explorer, right-click it, and choose Set as Desktop Background from the context menu.