I've just begun the Martha Scarf and the pattern says to knit the first 21 rows with colors A & B, then repeat with colors C&D, A&B and so on....do I cast off after the 22 rows of each blend...if not, how should I do this without having an array of 101/2 needles and a multitude of confusion? Here is the pattern link: http://www.straw.com/cpy/patterns/martha_scarf.html
Just cut the yarn (except the one you will continue to work with...in three of the color combinations, you will keep one of the yarns from the previous section). not too short, and start knitting with the new yarn. Weave in your ends later.