This image shows off some of the vanilla mob banners, based on their spawn eggs. (Zombie, Gurardian, Blaze, Cave Spider, Chicken, Mooshroom, Shulker, Slime, Spider, Stray, Vex)
This mod will support any modded mob that has a spawn egg. Here are examples from the Atum mod. You can find the Atum mod here: https://minecraft.curseforge.com/projects/atum