Favorite album art?

check out anything from hypgnosis. they designed many of the classic lp covers from the classic era....

A few more that quickly come to mind:

Ogden Nut Gone Flake by Small Faces
First Led Zep album
Nevermind Nirvana
Kiko Los Lobos
Kiln House, Mystery To Me, and Tusk from Fleetwood Mac
London Calling The Clash
Living Stereo Marti Jones & Don Dixon
Happy Trails Quicksilver
More Songs About Buildings and Food Talking Heads

"Blues for Allah" Music by Grateful Dead art by Philip Garris
"Tales from Topographic Oceans" music by Yes art by Roger Dean
"Brain Salad Surgery" Music by ELP art by HR Giger
"Dark Side of the Moon" Music by Pink Floyd art by Hipgnosis

Late For The Sky - Jackson Browne
Harbor Lights - Bruce Hornsby
Abbey Road - The Beatles

"In the Court of the Crimson King", King Crimson