Any number of 60's psychedelia covers such as this one . You know.... give your gilrfriend a hit of acid and a box of paints and say, "Now, pretend you're Peter Max and paint me an album cover". They looked cool back then, but now they just look like childish squiggles. Some of the music was great - the "art" just sucked.
BTW: I am breaking my own "ignore them and they will go away" rule about not posting to Shatner threads, even though this is obviously a Shatner thread in a very thin disguise.*G*