Edge from Bitmap?

I think what he is saying is that he wants to render the 2D billboard people like this 3D people example in the 1st post:
http://www.chaosgroup.com/forums/vbulletin/showthread.php?69957-VRaytoon-Thinks-Scene-Objects-Have-Been-Deleted

In that post it seems to be 3D people, but would be nice if we could do same effect for 2D billboard people