Source of images:

main_menu_original.jpg
from http://www.flickr.com/photos/97663393@N00/120973620/
(license: CC Attribution-ShareAlike 2.0)

train_crash_original.jpg
from http://www.flickr.com/photos/dvdmerwe/104898475/
(license: CC Attribution 2.0)

water_ducks_original.jpg
from http://www.flickr.com/photos/cygnusx1/22688395/
(license: CC Attribution 2.0)

human_beach_original.jpg
from http://www.flickr.com/photos/exfordy/386002036/
(license: CC Attribution 2.0)

wild_road_original.jpg
from http://www.flickr.com/photos/odalaigh/365952674/
(license: CC Attribution 2.0)

morning_buildings_original.jpg
from http://www.flickr.com/photos/terenceong/306320460/
(license: CC Attribution-ShareAlike 2.0)

locations/home/forest.jpg
from http://www.flickr.com/photos/garibaldi/522196113/
(license: CC Attribution-ShareAlike 2.0)

nany textures named lemog_xxx
from http://lemog.fr/
("xxx" in the filename is actual texture name on lemog).

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Editing:

The "corroded" versions were done by GIMP
"Script-Fu -> Ornaments -> Old photography" trick,
with border = 0 width (I didn't like border effect in this case).

The corroded version of wild_road also used
"Script-Fu -> Ornaments -> Coffe stains" effect
(with accidentaly nicely positioned stain).

The corroded version of human_beach was first (before oldphotography)
processed by "Filters -> Glass effects -> Glass tiles" effect
(on "photo" layer).