I've used Thangles, and I've also made them larger and cut them down to size. I don't find one of those methods any better than the other as they both involvd a bunch of cutting. My new method is the "quilters rule" where you cut 2 squares a certain precise size, use the "rule" to draw the diagonal line, precisely sew 1/4 inch on both sides of the line, cut the diagonal, and you have 2 perfect-sized HST. I've tried drawing the diagonal line and sewing without the tool, and they do not come out accurately. It must be me not being able to mark correctly, but now that "rule" has been working great for me.