Let's start with a classic
This isn't an upscaled picture of the album cover. The album cover itself was an upscaled picture.
... and then there's this little gem

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this is pretty much cheating but here it is anyway
LOL! Looks like the Cynthia doll from Rugrats.
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http://www.boredpanda.com/worst-album-covers-ever/
A pretty good list, though some of those are actually pretty great.
I made the mistake of Googling "worst album covers ever." OMG! I think I am going to be sick.
I had to stop after a while, it was too much for this graphic designer to tolerate.
Kirk Van Houten (Milhouse's Dad) sang this song on The Simpsons. LOL
that first one is fake, the headstock is not broken,
I'll keep it Metal \m/
EDIT: damn it, I just saw that this is in "Other Music Styles". Well, whatever, here's some shitty covers nonetheless.
Just gonna go through my phone to see the covers and pick out the worst. Too much to go through on my PC
Pest - Black Thorns
Great Black Metal album, horribly generic cover
Amon Amarth - Deceiver of The Gods
Most Amon Amarth covers are awesome, this isn't one of them
Dying Fetus - Descent Into Depravity
Some generic bullshit
Ea - A Etilla
This is just lazy
Craft - Fuck the Universe
Even lazier
Swallow The Sun - Hope
Cover's just fucking ugly to look at
Rompeprop, Tu Carne (split) - Just A Matter of Splatter
Wtf is this shit?! Might be the worst one on my list
Mournful Congregation - The Monad of Creation
One of my favorite Funeral Doom albums with a shitty and lazy cover
Comatose Vigil - Narcosis
"Hey, lets take a generic Google Image search picture of a wheelchair and reverse the colors" ...why?
Comatose Vigil - Not A Gleam of Hope
"We have to make our cover look gloomy and doomy, just like our music" ...when in the end it just looks like smoke. Lazy
Marduk - Panzer Division Marduk
Love the album, but this cover is horrible.
Sterbefall - Plattensee
What is even in this cover?
Mistress of The Dead - The River of Quietest Death
Another fav Funeral Doom album, another bad cover. Just a pic of a river with an ugly filter over it
Immortal - Sons of Northern Darkness
Almost as bad as their videos
Shining - Halmstad
"Be disturbed!" ...by our lazy album cover
There are definitely some absolutely horrible Grindcore / Gore Grind covers, but most are very NSFW
I dont actually think the cover of Deceiver of the gods was that bad. It wasnt as good as twilight of the thunder god or jomsvikinh but it was still pretty good. Also funny enough most of Immortals covers and videos were pretty bad but Abbath actually did a pretty good job on his solo album