I took an in person class with Laura Heine. She does an interesting technique and I was very glad I took the class. There are many different approaches to collage quilting. Some of it depends on what you are making with the collage. Wall hangings are very different than quilts that are going to be used. I'd look for an in person class in your area. With collage quilting there's a lot to be said for having an in person teacher who can advise you on your particular problems.