I was reminded of another favourite this morning.
Einstürzende Neubauten - Haus Der Lüge:
The cover is a wood cut from the 1500s by a printmaker called Hans Baldung. There are two more of his horses on other artwork in the album. When this album was released, in 1989, there was a merch slip in it. You could order the usual things; shirts, posters, badges etc. But you could also order a 20cm x 400cm wallpaper frieze with a repeating pattern of the 3 horses. I really wanted a couple of rolls, but at DM28 each and 30DM shipping, plus international ordering wasn't quite so easy back then, I never got around to getting any.