The most memorable album covers are often the simplest -- take Martin/Molloy's The Brown Album. OK... that's probably too simple. How about the radio waves on the cover of Joy Division's Unknown Pleasures? It was slick-looking in 2D and now you can enjoy it in 3D.
This specimen was 3D printed by one "akaziuna" over on Thingiverse, though it was based off of a previous design by other user. The original source though, are the radio waves from the first-recorded pulsar, PSR B1919+21.