I wear them in all seasons and love changing how I knot them to change the look of the outfit and the look of the scarf.
Some times a bulkier scarf can be reigned in and worn more elegantly with certain knots like a herring-bone style while a thinner, more casual knot can be fancified (yes, that is a word :):) with a Bow-knot or a French-knot.
I have found some beautiful scarves on Pinterest recently and also discovered that this site is a great resource for new and unique scarf knots and has great images and video tutorials on how to actually create the unique knotting styles.
Here are some great photos I found for helping you make all different kinds of scarf knots.
Plus an informative, fun video by Coldwater Creek that shows you a bunch of ways to knot a scarf to accessorize any outfit.
Have fun checking out all these unique scarf knotting techniques and Happy Knotting!
How to Knot Tying video by Coldwater Creek