Decided on a very simple quilting design, so not to distract from the Toile and the applique and a thread that blends with the Toile....
Step 1 - echoing the applique design - about 1/4 inch
Step 2 - a small grid 3/4 inch on point inside the applique
Step 3 - larger grid 1 1/2 inch on point outside the applique
Finished size: 18 inches square