I was delighted when I saw the emerald background and a beautiful owl (though, admittedly, I worried later about Portlandia Put-a-Bird-On-It backlash.) A big thank you to the Scribner design team.
The gorgeous owl is a hand-colored engraving by Eleazar Albin, and was included in his work A Natural History of Birds, 1731-38. I'm also a fan of his rooster, Gallo.
What appeals to you in a book cover?
Images from the public domain.