The titles of these posts are a bit of a misnomer because what I started exploring was what kind of monster would require a page to explain or run. Taking up a page doesn't necessarily require complexity. Here is an example that is not mine but something quite simple yet would benefit from pages premade and xeroxable in a bestiary.
It comes from this post way back in the olden times of yore. Basically it is a simple visual hit location system. I wanted to try my hand at it, so above is my image of a hydra with heads that do different types of damage. Boxes are all filled, that particular head is dead. Determine where a hit lands the way Zak suggests, toss a d4.