I can't help with classes but there is one person, Ruth B. McDowell. Her books are fabulous and I would suggest you look into them as a source for learning and techniques. One of her books, 'Piecing, Expanding the Basics', is page by page full of techniques and creativity. She is way out of the box creative in her perspective and if her style may not be to your taste, her teaching and techniques can help anyone become a better landscape quilt artist.
Give her work a look and see for yourself.
peace