I just took a class on this method last week. There are two wonderful books available by Karin Hellaby called "Sew Simple Pineapple" and "Pineapple Plus" by Quilter's Haven Publications. She uses the technique you are talking about and has many ideas in her books. Tip: Use the starch-type spray (Mary Ellen's something?) when you open and press to keep your bias from getting out of control.
Robin