[DustyPorViva]

I'd work REALLY hard on eliminating the pattern in those tiles, like the grass and asphalt. Secondly, I'd look up some real references to urban buildings and such instead of even thinking of Era. I can tell there are some bad habits already picked up from the style Era has that has creeped over into your tileset, even when it barely makes sense. These small details are what makes it hard to see anything other than an Era look-alike, even when the overall picture was never meant to be such. What's with the orange traffic-line, by the by?

As for the post-apocalyptic feel... you don't need to sacrifice colors or make it all goth in order to create a post-apocalyptic setting. Destruction of the environment does not necessarily mean destruction of art. Color is indeed more widely associated with beauty and life, but if done well can be just as convincing as anything else. L4D2 pulled it off pretty well, in my opinion.