Taken as a complete beginner. I'd only upgraded to a 500D from a camera phone the week before

Self portrait, holding the camera in my right hand, lamp off to my left. Just had a quick clean up in Lightroom. I'll try a few more now I have some free time.
To be fair, the lamp did have a lampshade as a diffuser
http://www.flickr.com/photos/56025993@N03/7841380090/
Self by
Andy_S_C, on Flickr
If you've not seen it yet the iPhone photoshoots are worth a watch. The first was to make the point that it's not the camera that makes a good image, however they used a load of other kit:
http://www.youtube.com/watch?v=TOoGjtSy7xY
The second is more relevant to your challenge, using an iPhone, natural light and reflectors.
http://www.youtube.com/watch?v=o063wC_SNxo