Here is a new tangle called Puf. This one is fun to do, as it starts off very boxy and ends up very puffy. This can be done with squares, triangles or rectangles. As you can see, it can be done inside any shaped string, too.
Hint: when drawing the Greek key shape in step 3, start at the outer edge and work to the middle. When connecting the corners in step 4, go through each little corner, even if it doesn't line up. This will give personality to the lines and make them "dance". Have fun!