Ekphrastic Beasts is an artist-created compendium of monsters for 5th edition that's up on Kickstarter now. They say that a picture's worth a thousand words, so the people behind the book decided to get together artists to really show off their talent and bring these strange creatures to life in all-new ways. If you want an art book that's also an RPG supplement, you'll want to check this one out.
From the campaign:
Ekphrastic writing is the vivid, often dramatic description of visual art. Our project is a full-color fantasy art book, which leads with spectacular artwork from 4 of today's most exciting weird illustrators, that also functions as an artist-created compendium of creatures for the 5th edition of the world's most popular role-playing game!
Rather than revisit known fantasy tropes, we begin with four established illustrators each creating striking, startling, original artworks straight from the abyssal depths of the subconscious. Each piece is then given to our author to reverse engineer creature names, back-stories, and stats for them all!
The result: an artist-created compendium of stunningly illustrated creatures, spirits, and demons which have never seen the light of day or dark of dungeon before!
The campaign is really close to its funding goal with 24 days left to go.