Have you thought bout using the small felter to pounce in the threads or buttons or Suffolk puffs. Could do one or both sides. You can machine using a walking foot straight lines either side of seams to shadow. Don't forget to start in the centre of the quilt and stabilise it in 4 directions first. Others are better them me but you don't mentioned that you have tacked or ( forgot the American word) the quilt before tying. My friend also free motions on a sewing machine it is possible but good exercise for th arms and hands. Straight lines or diagonals are good with a walking foot.how about a picture of the quilt for others to help with designs etc.?