For Earth...
I was thinking maybe have everything in ruins, most overrun by vegetation as nature claims the planet...

Sorta like Yaschas Massif [sub]-cough, cough- Yes, final fantasy again. :newlol[/sub]
[hider=ruins]
[img]http://vignette3.wikia.nocookie.net/finalfantasy/images/0/09/Yaschas_Paddra.jpg/revision/latest?cb=20100508162300[/img]
[/hider]

The original photo I used in the PM...
[hider=setting]
[img]http://3.bp.blogspot.com/-PLKA_4srIBo/UPmBcDfoYII/AAAAAAAACCw/W6D2-9wrV0Y/s1600/post-apocalypse+London+RyPV3.jpg[/img]
[/hider]

And the bigger cities like this...
[hider=post apocalyptic]
[img]http://www.thesleuthjournal.com/wp-content/uploads/2013/10/sci-fi-post-apocalyptic-28081_942730_1492542.jpg[/img]
[/hider]

Haha, I'm obviously having fun imagining the setting... and I'll most probably post a pic of where Julia is at the start of each post.