If you are talking abt the watermark, you can do it easily using Photoshop,
http://www.revver.com/video/504055/creating-a-watermark-in-photoshop-cs3/
or PHP
http://www.sitepoint.com/article/watermark-images-php/
http://koivi.com/php-gd-image-watermark/
If you are asking for that lower right corner image, then open the image in photoshop, simply write sth using text tool and apply drop shadow to it.
Hope that helps 