modification of my original pack to have the cover be based on the tool it is used on.
original pack here: https://www.planetminecraft.com/texture-pack/revenge-s-enchanted-books/
requires optifine to work.

-white cover = Armour
-light brown cover = bow/crossbow
-green-blue cover = trident
-dark blue cover = pickaxe
-light blue cover = fishing rod
-pink cover = sword
-other colors are un-categorized