QuickWall was initialy launched as a wallpaper app that would set wallpapers directly from the commandline. Later due to a lot of requests from users , a theme option was added which uses pywal to generate themes from the wallpapers.
Wall You Alternatives
Wall You is described as 'Wallpaper app built with Material Design 3 (You)' and is a Wallpapers Hub in the photos & graphics category. There are more than 25 alternatives to Wall You for a variety of platforms, including Android, Android Tablet, Linux, iPhone and F-Droid apps. The best Wall You alternative is Paperize, which is both free and Open Source. Other great apps like Wall You are Wallflow, Variety Wallpaper Changer, Panels Wallpapers and WMap.