I'll put I my two pennies worth regarding that last comment, avoiding monotony and creating diverse fictional worlds. I might just have something useful to say, after all, I spend half my life dreaming up new worlds... Then again, maybe not. Anyway, here I go.
When it comes to creating a fictional world, I think there are a great many things which must be taken into consideration. For a start, a world needs history, and there's no getting away from this. A world without history is a man without a soul, a hollow façade. This applies to any fictional world, but when you're setting your story in a post apocalyptic setting, it's even easier to forget that your world did not simply spontaneously appear in the state it's currently in. An apocalypse is a modifier, it's a chaotic upheaval which radically changes a society, often through the obliteration of much of what that society values and holds sacred. So who did this apocalypse happen to? What's an apocalypse that happens to nobody? Create that world, create that nation, create that town, create those people. Then unleash your apocalypse upon them and see what happens, see what becomes of that world and those people.
Now, your world may very well be modelled entirely on our own, the here and now. In which case, you need to make sure you know your world, this world. Don't be fooled into thinking that it's all been done for you when taking this approach, you still need to put a great deal of effort into making it believable, making it actually feel like our world.
Take an abandoned town for instance. It's not always been abandoned! Who lived there, how did this virus affect people physically and mentally. Think about how your society would break down in the face of inevitable annihilation, think about how different people would face it in their own ways. So, which family in this town was huddled in the basement, who was on the corner of the street selling salvation, who was proposing to that someone who they've admired for years, who was desperately trying to sell their shares off as a raging mob went marauding through the streets outside. Sprinkle your world with these little stories, the ones I've just suggested were a little cliché, although don't just avoid them solely because they're a tad cliché if you believe they would happen. We bleed when we're wounded, call it cliché but it'd be rather silly to avoid including it for that reason alone. But do of course give these little stories you own personal twist. Just don't overstep the line, it'll end up looking like that apocalypse hit a lunatic asylum if in trying to give things a personal twist you eventually warp everything into something truly bizarre.
I could bore the life out of you with more, but I think that'll do for now. Maybe you'll find something useful in there... I don't know...