I have seen where there are demos of face tracking in flash, and I figure if thats possible, then it should be possible to track a pattern on paper. There was a demo of something similar (not in flash) for the VW a while ago, I figure this should be possible in flash now it has 3d.
This would mean that you could export a 3d model from blender, and import it into flash, and make it look as though its sitting on a piece of paper on the webcam.
Here is a demo of what I was thinking: http://www.aktasway.com/blog/2010/06/03/livemesh-1-0/, however, its not in flash.
Anyone have any idea where there may be a script to do this in flash??