AKA [AT]. Allows you to essentially combine different aesthetic mods by letting you mix and match assets. (Example: if you install 3 different wallpaper packs, that's triple the amount of options you have for wallpapers). I recommend using [CP] addition packs (when available) simply because they load faster; however, if those don't exist, or are only available as replacements, [AT] is a solid option. You can usually delete individual textures you don't want to help with loading times as well.