I would stitch in the ditch on the butterfly runner. If you take you quilting slow, you can outline the butterflies. The Xmas runners, I would mark diagonal lines in both directions and cross hatch the center section. I would try your best to match the thread. I am sure there are u-tubes on crosshatching. I have seen Eleanor Burns demo cross hatching. Your husband is a keeper with his eye for fabrics. They turned out very pretty.