Reference from Flickr

http://www.brameulaers.com/tutorials/generic_wall_tutorial/generic_wall_tutorial.html
http://chrisholden.net/tutor/floortile01.htm
http://wiki.polycount.com/CategoryEnvironmentModularity


http://www.flickr.com/photos/piedraaltoaragon/5125682555/



http://www.flickr.com/photos/lydneykopite/5009043916/
http://www.flickr.com/photos/lydneykopite/5012099153/
http://www.flickr.com/photos/lydneykopite/5065004807/in/photostream/

http://www.flickr.com/photos/twiga_swala/4714388748/
http://www.flickr.com/photos/twiga_swala/4714402324/

http://www.flickr.com/photos/jorolat/5305176859/
http://www.flickr.com/photos/hofercam/3699473588/
http://www.flickr.com/photos/rcahms/4468642162/
http://www.flickr.com/photos/saintrobert/244323338/
http://www.flickr.com/photos/lokas/454202654/
http://www.flickr.com/photos/loupiote/5237463396/
http://www.flickr.com/photos/rakche/5120221826/
http://www.flickr.com/photos/jorolat/1567363246/
http://www.flickr.com/photos/computerhotline/4431405017/
http://www.flickr.com/photos/connellda03/4474033400/
http://www.flickr.com/photos/shaunotd/374894726/
http://www.flickr.com/photos/computerhotline/5132381696/
http://www.flickr.com/photos/devastar/85346535/
http://www.flickr.com/photos/rohidas_gaonkar/5467174159/
http://www.flickr.com/photos/akatayama/4925218496/

http://www.flickr.com/photos/drainzchic/4561014148/