I just saw "Let The Right One In" and realized those crappy Twilight vampires don't have to even be invited in. They don't even need to sleep. They're cheater vampires.
Hey, as soon as I can think of a gimmick that will get 50 zillion fangirls swooning, I'm there with you. Vampires have been done to death, no pun intended, so it has to be something else unworldly so there's no pressure to try and "make it happen" IRL.
What about:
Cowboys with powers. Young Guns for a whole new generation!
Sassy demon pirates. Like Pirates of the Caribbean except
everyone looks kinda gay.
Rockstar knights. They sing, they joust!
Robot boyfriends who dress like they live in the 70's.
Pouty alien supermodels. Work the camera, then blast it with a fireball.
Emo monster-trainers. The girls will swoon for the emo dudes and think the beasties are oh-so-cute.
Stripping supercops. "Ma'am you are under arrest..." *cue thumping beatz*
Zombie pop idols. He's dead but he's also famous!