Pictured above is the Shades of Plaid Scarf by Julie Armstrong Holetz from Crochet Me (Ravelry Project Details). Made with three colors of Berroco Ultra Alpaca, it was a quick and easy project. You basically crochet a large mesh scarf and then weave chains through it.
The placement of color is the key to getting the nifty plaid look. This particular scarf was made as a sample for a workshop I’m teaching this fall. I would totally make this project again.