This anthology is looking for more stories (and the blog uses a similar theme too). I’d try my luck with it, because the only way to improve your writing voice is to use it.
The problem: I don’t write horror at all, including zombie fiction. I don’t have the stomach for it.
This isn’t something I’d outsource, like I will with romance. Outsourcing what should be my own work would feel like cheating to me.
So I’ll pass on this one. I have ideas for a science fiction universe anyway; that’s my genre.