DebD800 is right, it is called Stitch and Slash. I learned it in a class I took at a local quilt shop and there is also a class on it with Craftsy. You layer 4 or 5 pieces of material, sew a design joining the layers together, then slash through the layers, deciding how many you want to go down, with a seam ripper. Then you couch yarns onto it, do some decorative sewing, add embellishments like buttons, etc. Here's the one I did.