That's one of the cutest Sunbonnet Sue and Sam quilts I've seen in a long time -- such great fabric choices! When I quilted mine, I did diagonal lines about 1" or 1-1/2" apart inside the blocks up to the appliques. You usually don't quilt through appliques. I think I did some kind of simple flower motif in the sashing. I have a picture, but I don't think the quilting design is clear in the picture.