Have you heard of the Circle Scarf from American Apparel? It's one long, super-comfy, infinity scarf that can be worn tons of different ways. It's so versatile that it can be thrown on casually or dressed up for a work environment. It can also be worn as a traditional scarf, as a dress, or (for the especially brave) a head wrap.
I'm wearing one belted with black pants and long sleeved shirt today at work. Trying to stop myself from buying one in every color!