i took the photos (yeah, my avatar is the photo i used) then i used photoshop to turn them into black and white. i got the idea from spending too much time looking at the stencilling section.http://ohmystars.net/craft/index.htm
has a good tutorial in the stencilling area on how to turn photos into stencils, or in my case...this.
then i printed them out the same size as my canvas and used a permenant marker to attempt to trace the outline on to the canvas.
the white paint i used as a base didn't like that idea much, and i ended up freehanding a lot of it.
then i just painted in the black.
very cheap and easy.