This came from an idea to do portraits on the street corner- I haven't come that far yet, but it intrigues me that I could do it any time I want to. I think it's fear of the unknown that keeps me from it.
In any case, there are six 18 x 18 portrait blanks on one yard of Linen/cotton. This will make six 14 x 14 canvases, allowing for a two inch wrap around.
Use a semi-transparent white in the center and layer your drawing/painting over that. Some or all of the purple should peek through in places. Enjoy!