You only have to select the theme and next wallpapers will suit your needs perfectly.
You can decide whether to have sports, nature, bikes, children, abstract or any other kind of wallpaper.
Of course, you can set the time the wallpaper will be on.
In short, if you need new wallpapers and you don't want to search for them, you can let it in the hands of Pulse. It will download new wallpapers and will change them automatically.