Have you tried any of the awesome classes offered at Craftsy? They offer a wide variety of video classes on topics like quilting, sewing, and cake decorating too. You can even see the lectures from QuiltCon for free! I'm taking Angela Walter's machine quilting negative space class now and loving it. I even tried some of the techniques in my Sew Cherry Over and Under quilt that I recently finished.
Right now, Craftsy is offering some of the quilting classes for up to 75% off. It's so hard to choose between Leah Day, Camille Roskelley, and Elizabeth Hartman. But the price is right, so go find one (or two or three) that suits you!