iOS Device Wallpapers (744 x 1392)
To set as wallpaper: Tap the image you wish to use. Touch and hold the image, then select “Save Image” from the list of options. Locate the “Settings” icon and open “Brightness and Wallpaper.” Select “Wallpaper,” then select “Saved Images,” and select the image.
Surface Pro Wallpapers (2736 × 1824)
To set one of these images as your Surface Pro background, click on the thumbnail, then save the image. Set the image as your wallpaper using instructions found here.