I recently got a copy of A Practical Guide to Monsters. An in-universe reference volume for apprentice wizards, it lists 53 different monsters by my count. Each of them has a bit of fiction, a fact box (e.g. height, weight, habitat, diet, attack methods, etc.), and an artistic representation. If you think this sounds like a Monster Manual, then you’ve got the idea, but the book includes no game statistics. In effect, you can think of the guide as a monster manual for kids. Some of the monsters even have associated maps and marginalia.
The illustrations bring out the ideas behind each monster without scaring small children. A few of them include a child-like goblin running away or otherwise engaged in some activity. This gives kids a way to imagine themselves interacting with the monster but in a reasonably survivable way. Several intermediate sections list weapons, armor, and equipment that an adventurer might need. My kids and I have had a nice time looking through it and talking about what it might feel like to run into some of the monsters.
I don’t want to give the idea that the guide only works as a children’s book. The free Dungeon Master’s Basic Guide lists statistics for a little under half of the listed monsters, and the Monster Manual for 5e includes almost 90% of them. Exceptions include the Yrthak, Ormyrr, and Athach, among others. The Microlite20 expanded monster list includes about the same number. A GM could easily convert the exceptions from other editions.
So in addition to the coffee table aspect, this book works well as a way to illustrate monsters to players. A game with children or using a retroclone would particularly benefit. Wizards of the Coast first published the book in 2007, so lots of stores carry inexpensive copies. They published a whole series of Practical Guides (“wizards”, “dragons”, etc.) and I look forward to getting a few more for my home library.