Instructions
After clicking on one of the links above, a large JPEG version will appear. Then ...
Windows users: Right-click the graphic you want to set as your wallpaper. From the pop-up menu that appears, choose "Set as Desktop Background". View your desktop to see the graphic displayed.
Mac OS X users: Right-click the graphic you want to set as your wallpaper. From the pop-up menu that appears, choose "Save/Download Image As..." and save the image onto your computer. Open up your System Preferences (usually from the Dock) and select "Desktop". Locate the file you just saved and drag it directly onto the mini-desktop in the preference pane you just opened. View your desktop to see the graphic displayed.