While reading an article on this subject, the author used a piece of wax paper over the area and used her fingernail to draw on the wax paper. You could use a wooden dowel sharpened like a pencil. Draw several areas using different designs. When I look at the large blue area, I would draw half of a circle to meet at the edges of that area and then fill in with 1" echo. See how that looks to you. You could still do the big stitch method after you decide what to quilt. When you break it down to sections, then it doesn't seem so "big" and will make it easier. Have fun with it.