Random Photo Radiant Extension
I just released my first contribution to the Radiant CMS extension library. My extension adds a "random photo" tag that can be used inside any Radiant page. It selects a random photo from a specified directory and renders the appropriate IMG tag.
Here it is at Radiant's extension library: http://ext.radiantcms.org/extensions/272-random-photo
Here's the git hub: https://github.com/jeremyfsu/Radiant-CMS-Random-Photo-Extension