To download pictures:

To save these images as wallpaper, click on the image you would like to download, a new page will open with the full size image.

PC: Once the image has loaded right click on image and select 'Set As Wallpaper' or 'Set As Background' from menu.

Mac OS 9: Save image, open Appearance control panel. Select Desktop folder tab, Place Picture.

Mac OS X: Open System Preferences, click on Desktop settings. Drag image from desktop to preview box in Desktop Preferences window.