I think I'll include anything here that might be considered B, C, or Z movies, as well as parodies of/homages to the genre. Though technically, B-movies aren't a "genre"; there are actually lots of different genres that can be B-movies. And I don't always know whether a movie qualifies for this label or not, but I do my best to figure it out.
stuff I've seen:
Elvira: Mistress of the Dark
Psycho Beach Party