I was bored on a plane, so I made a web interface to generate messages for the MiniPOV3. I found it to be immensely useful on my project, and thought I'd share it in case anyone else would like to use it. There's a "Get C" button that will give you the C code for the image you drew. It's at http://zachrattner.com/pov/
It's all done in HTML/CSS/JS, so "View Source" will get you everything you need to hack it up.