WINDOWS: click on one of the links, corresponding to your screen resolution (or closest to that setting). Put the cursor on top of the image, hold down the right mouse button and select "set as background" or "set as wallpaper". MACINTOSH: click on one of the links, corresponding to your screen resolution. Hold down the mouse button until a pop-up menu appears and select "download image to disk." Use the Appearance Control Panel to set the saved image as a desktop picture.
       

800 x 600  

800 x 600
1024 x 768   1024 x 768
1280 x 1024     1280 x 1024
1600 x 1200   1600 x 1200
1920 x 1200   1920 x 1200
 

800 x 600   800 x 600
1024 x 768   1024 x 768
1280 x 1024   1280 x 1024
1600 x 1200   1600 x 1200
1920 x 1200   1920 x 1200
 
800 x 600   800 x 600
1024 x 768   1024 x 768
1280 x 1024   1280 x 1024
1600 x 1200 1600 x 1200
1920 x 1200 1920 x 1200