Show Off Your Favorite Cigar On Your Computer
On Windows, click on the size that matches your screen resolution most closely. Right-Click on that image and choose "Set as Background".
On Macintosh OS 9.x, click on the size that closely matches your screen resolution. Right-Click on the image and save it to your hard drive. Go into the Apple Menu and choose Control Panels > Appearance. Navigate to the Backgrounds tab. Drag and drop the saved image into the background drop area.
On Mac OS X, download the image as with OS 9. Go to System Preferences > Desktop and follow the instruction for OS 9 Users.