Philip Taffee uses stencils, silkscreen, collage and other techniques on his canvases.
You can turn any image into a stencil. Select your image and upload it to Bay Stencil aka the Stencilizer here. Within in minutes the site emails several options to you to print and use free. Or, you can order a custom cut stencil of your image on their site.
Full details on how to create a stencil from any image in this Instructables article here.