Why is there no album based on the Count of Monte Cristo? Though if we're talking more just general themes, ellaborating on the current ones is fine and dandy. We really should explore lyrical themes involving foreign cultures more though. Death metal involving stories about african tribes and their wars would be quite neat. Or maybe the forced colonization. Hell, modern african warfare is just as bad, it just lacks the appeal of a tribal setting for the most part.

Also, why is there not more black metal dealing with voodoo and tribal rituals? You'd think that'd be an easy pick.