There hasn't been a lot of that kind of thing... I think your best bet would be to look for girls from specialized animes, since that's often how girl packs are compiled. Aside from that, there monster packs (Mehzerz' in particular) of random girls have the most "unique" girls (slime girls, werewolves, zombies, fairies, etc.) If the mood struck you, you could take some of those random girls and create unique stories and profiles for them.