Farce the Music has posted another collection of parody album covers, one of which is something I have actually thought about.
Although I don't think Alfred E. Neumann could really handle it, the one about "Murder Ballads of the Appalachians" is something that someone should really do.
I have specifically wondered how hard it would be to research, track down and create my own collection of folk, bluegrass and old-time country songs about murder. There seems especially to be a recurring theme of the singer having killed a woman (usually his girlfriend), for example "Knoxville Girl."* Unfortunately that's the only one I can think of right now off the top of my head, but I know there are others. There's even a Wikipedia entry on it.
*Read those lyrics and then feel free to think: WTF?