To set them as your desktop background, right click and select Set as background.
 

Screen Saver!

If you have Windows XP you can even set up a slide show in your screen saver!

To set up the screen saver in Windows XP:
1. Extract the files from the zip file to your hard drive - c:/art-iceland
2. Right click on a clear spot on your desktop and choose Properties
3. Click on Screen Saver
4. In the drop down menu, select My Pictures Screen Saver
5. Click on Settings
6. Click on Browse and find the folder - c:/art-iceland
7. Confirm by clicking on OK twice.