One of my favourites: Jackson Heights (on the original UK issue the front doors of the bus open to reveal a miniature of the pic of the band that's in the inside gatefold)
A couple of Badfinger albums. No Dice: Wish You Were Here (it's hard to find one continuous image because it's not a gatefold sleeve, but it is all one picture):
All three albums by Flash feature normal human body parts, obscured here in Spoiler Spaces while Delicate Types fetch some pearls to clutch and salts to smell. Spoiler: Eponymous first album Spoiler: In the Can Spoiler: Out of Our Hands
Fantastic album cover, one of the very best, classic. I remember in my early record buying days I'd see this album at the store and want to buy it but it was out of my price range ( it was eight dollars!). But I got it eventually of course and it was worth the wait and the money.