My idea is pretty simple,
try and get as many parts of opencv working on the n900 i can possibly and make a re-distributable .deb
then im going to make a python api that tracks colours, hands and some basic things and can dock into other applications easily and have this functionality.
Then a demo app to show it off, mentioned above to be able to draw using gestures and stuff.

I have just about begun, ill keep everyone posted. proper dev starts after the 21st as soon as im done with my exams..!