What is your favorite album cover?

Jethro Tull - Stand Up is a good one, also Roxy Music - For Your Pleasure as well as the first eponymous release. I also like the cover of Blue Skies by Stan Getz.

Blonde on Blonde, one of the first rock gatefolds.
It really used the space with a fold out half-length photo of the artist in a suede jacket, the image slightly out of focus, seemingly alluding to the complex instrumentation of the music inside.
This iconic 1966 image rock-star image gave way a couple of years later to the backwoodsman image, still in the same jacket.
Happy 80th Bob.

The Rolling Stones ‎– Their Satanic Majesties Request

Santana's first album.

LOOK closely at the Lion head and what you see in it.

Once you see it, look more closely at what's making up what you see.

Great piece of Art by Lee Conklin.