I like this plugin, but there is something missing. I have lots of JPG images, but also some PDF & PNG files in my media library. I certainly don't want the PDF files to show up with the random images. My header images are PNG and it shows them along with the JPGs which I don't like. My wish would be that you could specify what types of files to display or what types of files to exclude. Give us that capability and I'll bump it to 5 stars.
UPDATE Feb 6, 2014: Today I find the plugin is not working at all. It worked fine, but recently 2 things happened. There was an update to the Plugin and today my server was upgraded to PHP 5.4 and PHP 5.2 was discontinued. I'm not sure which update caused the plugin to break for me, but I'm suspecting it is the PHP upgrade.