My biggest tip goes along with your number 5 - unusual places. After you think about it, it's not so unusual but you just need to not get caught up and remember what you see. I watch a lot of History channel and Military channel and Discovery channel - stuff like that. Military has at least one map every 2 or 3 hours somewhere. History and Discovery you sort of have to have the right show but those maps are cool, too, like the show on The Plague, The Barbarians, etc. Discovery and Animal Planet have lots of great overhead shots in shows like Planet Earth, Great Migrations, etc. if you like the realism. Also I collect a lot of nature photos from various places just to stir my imagination.