I like all the overgrown photos. Thats what we'll really be shooting for. They're inspirational. As for the other ruined city photos, meh. Skyscrapers cannot be tipped over without falling, they're not designed to withstand that. They might be able to tilt a max of 5 degrees before the frame gives way. Its designed to hold support for vertical weight bearing and some horizontal sway. Not horizontal weight bearing.
More overgrown city pictures would be fantastic. I plan on making the flooded part a sort of swamp so if you can find anything like that, I love you long time!
I have'nt discussed this with Oz but the atmosphere I want to shoot for is green and 'nature infested' on the outside and desolate on the inside (inside of buildings)