Incase you are looking to rotate the display you should look at the problem How to rotate display in xp.

This question is about cycling thru various wallpapers. 

Download and install Winter Wallpaper Changer for Windows XP which is part of Digital Photography Winter Fun Pack 2003.

By default, the Winter Wallpaper Changer shows winter images included with the Wallpaper Changer. The winter images are located in the folder "\My Documents\My Pictures\Windows XP Fun Pack\Winter 2003\Wallpaper". You can change which images display by adding or removing images from the Wallpaper folder or by selecting a different folder of images to use as wallpaper. Here's how to add a different folder. 

1. Double-click the taskbar icon or right-click the taskbar icon and select Configure Wallpaper.
2. In the Options window you'll see a list of folders on your computer.
3. Browse through the folders that contain images you'd like to use as your wallpaper. You can preview the images by selecting the folder.
4. Once you've selected all the folders that contain images you'd like to rotate on your desktop click Apply or OK.

If you select a large drive or folder containing thousands of files, the search for images can take a long time, slowing the Wallpaper Changer and your computer's speed. For best performance, avoid selecting very large folders or network drives and only check Include All Subfolders on folders local to your computer with a reasonable number of image files (less than 600).

You can learn more options about the program from the Microsoft's website.