To set an image as your desktop background, right click on the image and click “Set as Background”
How about some optical illusion art? Which size would you like for your desktop wallpaper? 1152×864 | 1024×768 | 800×600
This illusion seems to work on some people but not on others. As you stare at the arrows in this image, you’ll see that they actually start to move. Of course, they aren’t really moving, but it sure appears that way! Give this one a minute or so as you stare at the tips of the arrows.