http://code.tutsplus.com/articles/the-top-8-placeholder-services-for-web-designers--net-19485
http://stackoverflow.com/questions/14549073/tutorial-to-create-a-placeholder-image
http://stackoverflow.com/questions/12186460/generating-placeholder-images-with-php-like-placedog-com-and-placekitten-com
http://motyar.blogspot.co.id/2010/09/create-image-placeholder-with-php.html
https://gist.github.com/uhtred/5208478
http://skymaiden.github.io/php-placeholder-images/
https://jamesallardice.github.io/Placeholders.js/
imageplaceholders
placehold info org
