http://www.jqueryrain.com/2012/04/top-jquery-snow-falling-effect-plugin-tutorial-with-example/
http://www.jqueryrain.com/2012/12/best-jquery-page-flip-book-effect-with-examples/
http://webkrauts.de/demo/2012/adventskalender/finale-js.html
http://daneden.github.io/animate.css/