There are several websites that cover this, but this pic made me sort of smile ashamedly.
Attachment 5220
The Millie Jackson one here is about as awful as you can get. It's near the bottom on the left. I mean, it's a special kind of bad.
The "Ken By Request Only" is really, really bad, too.
http://www.coverbrowser.com/covers/worst-album-covers
http://www.octanecreative.com/Parody..._album_covers/