It's a super easy, no-sew scarf that I made using fleece scraps, scissors and masking tape.
First, take two pieces of fleece in 1/2 the width + 2 inches of your ideal scarf width, and in the desired length. Tape a line 2 inches in from one long edge on each half. (see pic)
Now carefully cut even strips 1.5 cm apart down the length of the scarf.
Next, tie two strips together - one from each half. Make each knot the same (i.e. - right over left, right over left).
Finally, wrap around your neck and be warm!