A number of albums have good covers. However it's perhaps a tougher task to not only make a cover pleasing to the eye, but to also give a good idea of what the band and or the music will be like. I think the cover of Van Halen's 1978 debut does both. You have Diamond Dave looking like he's charged up, Eddie Van Halen showing confidence and that cool guitar, Alex Van Halen playing drums like a madman and Michael Anthony looking he's going to run someone through with his bass. Then throw one of the best logos of all time in the center and you have a strong cover.