I stitched in the ditch on my Jar Quilt. I then added squiggles around inside the jars. Kind of like flying insects flying around inside. It depends on what your jars hold. Are the fruit or food? You could just do some loop de loops around some of the fruit/food. Check the batt for the quilting requirements and that might tell you how much quilting is needed. You could just quilt a pretend label across the middle of your jar if that is all the quilting required.