Flex Drawing

Graffiti Library(AS3 Drawing Library)
http://www.nocircleno.com/graffiti/
http://www.nocircleno.com/graffiti/examples/drawing_app_1_2/

Flex Drawing Tool
http://point.mathfan.com/Flash/FunnyDraw/FunnyDraw.swf
Source:
http://good.gd/245688.htm

Flex Paint
http://www.jamesward.com/2006/08/16/flex-paint-flex-display-object-to-png/

http://manewc.com/2008/02/13/as-3-recreating-the-drawing-tool-with-actionscript-3/