The answer is to insert an appropriate mask. Here I have chosen a piece of green handmade paper which includes metallic golden highlights. I cut it to size, and then insert it between the front of the canvas and the edges which have been folded to fit in the frame. Note that you DO NOT trim the canvas to the size of the frame, or the edges may unravel!
Prayer: Father, the love must extend even to the details! Help this family to find joy in the details of their lives.