Flameduck, what did i ever do to you to give me such harmful advice? :P
Ninjas are super cool!Seriously everyone makes boring fantasy packs or boring WWII packs. The spaceship pack thing is probably the only one that you mentioned that might have personal interest, but I'd need exlusive rights, and need it to be to specification.
Other than that, I think most people are looking for flexible "Poser" type models.