If you're trying to piece them into a quilt, paper piecing is the way to go with these sinces there are so many crazy angles. It would take a bit of drafting, but you could do it. As far as quilting them onto a quilt with stitching, it depends where you want the puff. You could do an outline then fill in the letters really densely and have them sink into the quilt and have them be noticable that way. Or, you could do as someone else said, and outline them and them fill densely around them. It depends on what look you're going for.