To tell you the truth, I never really look at album covers that much. What interests me is the music inside. I don't even think I can remember too many album covers off the top of my head.
I can remember the cover of Metallica's Ride the Lightning, with the electric chair flying around in the storm. Then there was ALS by Vai, with his ever-so guant face painted silver.
Those are really the only two I can remember right now. Like I said, it's about the music, not the artwork.