Desktop Wallpapers are for personal use only. You may not use them for commercially or redistribute them.
To download a free HD wallpaper, just click on one of the small thumbnail images for a larger preview and then select your screen size from the list on the right.
To purchase a license and download a full resolution image, just click one of the 'buy now' buttons on the next pages. This will take you to the Natures Desktop SmugMug Photo Gallery where you can choose the type of Royalty Free license and even buy Prints & Canvases. Info and pricing see image licensing page.