You could choose to go with this chain scarf by Toggle...which makes me think of both Mr. T and Jacob Marley from A Christmas Carol. A ghostly Mr. T would be a pretty innovative costume and a sure twist on Dickens. "I pity the foo' that don't honor Christmas in they heart!"
The Do Not Cross scarf by Fuzz is so cool it's almost criminal! (seewhatIdidthere?)
If you'd like something a little edgier, a little more cutthroat, there's always the bloody saw scarf. It goes hand in hand, or perhaps I should say runs neck and neck with Do Not Cross...actually, they're the perfect pair. Wear the saw one day and the crime scene the next, and you can be your own inside joke!
H.P Lovecrafty! The Dread Cthulhu has never looked so adorable! You'd be mad not to love this lil' guy! There's a lot of cool Cthulhu inspired clothing on the web...it's amazing what these artists dream up.
Finally, let's finish off with something sweet. I'm loving this candy corn scarf, and nothing says Halloween better than high fructose corn syrup...just ask any kid with a trick or treat bag.
Happy Halloween!