And I managed to get the 2nd prize, free AR.Drone + Nokia N900. 
CuteDrone / CuteFace is a face-controlling application done with Qt/C++/Python/OpenCV for AR.Drone. It was completed in 24h time frame in MeeGo Summit FI 2011, Tampere (http://summit.meegonetwork.fi).
Project page:
http://code.google.com/p/cutedrone/
Demo video: