I love zombies too!
We love the undead, but the term "zombie" can be interpreted a lot of ways. Successful subs will look outside the box. We've seen zombie plagues, zombies hordes, zombie hunters, and zombie super-heroes. What else have you got?
Characters matter. So does story. Would your story work without zombies? If so, chances are good we'd like to see it.
As always, we'll consider all genres, providing they link back to the theme. So, zombie SF, zombie mystery or romance, fantasy or horror - it's all good.
Big Pulp pays a token of 1c per word, up to $25 USD, and full guidelines are here: http://bigpulp.com/submissions.html