HOW TO DOWNLOAD
Click on the resolution of your screen beside each thumbnail. A new window with the image will then appear. The downloading format of each desk is in .JPG or .GIF so that both PC and MAC users can handle them.

For those of you that don't know how to turn a .JPG or .GIF file into a wallpaper read the two tips on how to:

Open up the file in a graphics program and save it with the extension that is standard for your operation system. If you are using windows the extension should be .BMP and if you have a mac it's .pict. Save the file >> then go and change the settings for your desktop and select the file. This option is recommended.

Use an image viewer like ACDSEE they usually have an option for setting the wallpaper and in this case mostly you don't have to resave the file with a different extension.