All photographs used were found on Flickr and are governed under Creative Commons Licenses. These licenses allow shared, derivative and commercial work.

http://www.flickr.com/photos/margin/122523599/
http://www.flickr.com/photos/torley/3177601026/
http://www.flickr.com/photos/lilcrabbygal/377416299/
http://www.flickr.com/photos/i_want_some15/2621611114/
http://www.flickr.com/photos/kimota/249750954/
http://www.flickr.com/photos/ravenelle/2575659552/
http://www.flickr.com/photos/designshard/3414887768/
http://www.flickr.com/photos/ravenelle/2574826607/