I just did randomly placed, kind of parallel lines with the biggest spaces about 1". I think it is all quilted, but I might go back in and add one more line in each zig zag.
I decided to go ahead and trim it anyway because it won't get distorted even if I go back and add more lines of quilting. I'll take a good look at it this morning and decide. Then I can cut the binding for the 2 quilts and finish them.