Not sure what kind of music you are putting on this disk, but you could always create a physical concept cover and photograph the scene.
I've seen some cool desgins where the person either created a shadowbox with a scene inside, or a flat image made from construction paper cutouts (think SouthPark), or something like that, and then photgraphed it, placed text over the image, and went from there.
Guess it all depends on how creative you are at that sort of thing, and how much time you want to invest... if you just want something for the cover and can't get the specifics out yourself, there are plenty of people I'm sure who'd be willing to come up with somethin for ya.