Ladders in Vanilla Minecraft feel kinda flat. And when you hold them in your hand, they're 3D anyway, so why isn't the block 3D?
Regardless of the reason, I decided to make them 3D. Additionally, this resource pack will work with any of the additional ladder variants added in the Crucial 2 Modpack (linked below).
Ladders added by the Quark mod (others in Images tab) (also includes vanilla ladder).
Note that I did not make any textures used in this mod, only models.
Also note that this pack will work in regardless of whether you have the mods adding the ladders or not.
Crucial 2: https://www.curseforge.com/minecraft/modpacks/crucial-2