Photo Paper - smart wallpaper description
Photo Paper will update your wallpaper automatically in the background with photos from 500px (https://500px.com) based on your preferences.
Photo Paper does not run continuously in the background like a live wallpaper, it only runs for a short time to update the wallpaper.
Photo Paper is open source and available on GitHub (https://github.com/lkorth/photo-paper). Please submit any issues or feature requests via GitHub.