You can customize the sources it pulls wallpapers from by importing collections, topics, following users, adding search queries. This allows for fun behavior, so you can type "Puppies" in the topics and your wallpapers will be of cute puppies. You can also customize time of day for each source, so you can have a setup that, in the morning, pulls from the "coffee" query, in the afternoon it pulls from the "Summer" collection and in the evening, maybe you want darker wallpapers, so you can pull from an OLED collection or a night/film shots collection.