Autopsy - Mental Funeral is a cover that really gave me nightmares once I recovered from the shock (I was like 12 years old) my only dream was to have that goddamn t-shirt but it never reached Chilean shores
Iron Maiden - Somewhere in Time (How much details it has?)
Nile - Black Seeds of Vengeance (if you think that Wes Benscoter best artwork was Slayer' Live Intrusion you better check this out)
Savatage - Dead Winter Dead (Sin Palabras, I don't know how to say that in english maybe: no comment)
Nuclear Assault - Handle with Care (Just three words over the image of the Planet Earth and all of us inmediately understand the meaning of the cover, great art)
Pungent Stench - Been Caught Buttering (that t-shirt I had, once was black but cares now right?)
Iced Earth - Something Wicked this Way Comes (No comment)
Fear Factory - Demanufacture (Barcode on the spine, good idea also)
Finally the best:
Mercyful Fate - Don't break the oath
You don't need to put 12 demons fighting to freeze someone veins just one coming out of the Flames (In LP size of course) and you got it.