I had to replace one I got in highschool. First FO after I figured out an 8'x8' blanket in SC probably wasn't the best thing to start with.
I just used SC and a K hook with a bulky yarn (softee chunky).
A little more difficult would be to change colors every other row (which is what the girl who made the one I was replacing did).
If you're wanting more difficult or not a winter scarf this site is indispensable.