Some people recommend ending your stitching by making a few tiny stitches in place, then trim off the ends. Another method which I usually use is to just trim off ends fairly long and then go back and using a needle, pull them to the inside of the quilt. It is not noticeable that way. The method I use is better described on LeahDay.com. She has lots of information on her site related to free motion quilting and recently, walking foot quilting.