I like finding inspiration in real-world examples, and my apocalypse-media diet consists largely of non-fiction. There are, of course, lots of modern-world ruins scattered around the world that can provide good AW scenery- Pripyat and Hashima Island being the most famous, and notable on account of the depth of the disaster or the sheer scale of stuff that was left behind.
But there's a little apocalyptica just about anywhere if you're willing to look for it. Urban explorers going to abandoned sites and ghost towns are turning up some great, frequently eerie material.
Check out
http://www.uer.ca/forum_showthreads.asp?fid=1&catid=103 for some visions of what you can throw at your players.
For a "living apocalypse" you could turn to accounts of life in Kowloon Walled City which was, for all intents and purposes, an enormous holding, or maybe several sharing a very tight, almost vertical geography. Picture an urban "island" surrounded by foreign territory, a jumble of sunless narrow streets, run by informal associations and triads but largely anarchic, recycling and re-purposing and jury-rigging their living space with limited material, making it all up as they go along. Consider
http://www.archidose.org/KWC/.