[EveV]

I didn't really like any of them x.x
They all sound zombie manga stereotypical.

This is an extermly hard topic too create with, since you have to have loads of originality. Because you're competing with every single zombie related manga/comic out there. Sooo personally I'd go for something that tied more into the mangas moral/theme. For example lets say what makes you're manga original is the fact that you got to characters falling in love in the midst of zombie chaos. Then it'd be something like , " The Love In Death".
However this is coming from someone who has no professional experience in that field. x.x