Wallble is a nice desktop wallpaper discovery tool. It lets you search for, download and apply tons of wallpapers featuring cars, animals...
— Is it possible to save the wallpapers as data in the full version?
No, you can't save the images once they're downloaded. All the downloads are stored in the default category and there is no way to get it outside the application. This means that the only way to use the wallpapers is through this way.