Its interface is quite simple and its use is not at all complicated. All you need to do is add the images that you want on the list. Once you do this, you can configure some of the additional parameters like the duration of the presentation, the time of the transition and even the duration of an individual image as wallpaper.
CreBS doesn't have configuration menus nor complicated, hard-to-understand controls. For the least experienced, putting together a presentation as wallpapers will be a matter of adding and applying images.