Intarsia knitting

knitting intarsia, blocks of color are worked with separate balls or bobbins of yarn, producing a sweater only one layer thick. Before starting to Intarsia knitting, wind each color onto bobbins, so you will not be carrying yarns across the back of the sweater.Intarsia knitting is well worth the time it takes to wind bobbins, Intarsia knitting,which you can keep up close to your work. Purchase knitting bobbins, but we prefer to buy bags of wooden spring clothes pins, which are inexpensive in bulk, and easy to wind and unwind.With the back of the sweater facing you, thread an embroidery needle on one of the hanging ends. Insert the needle vertically into the adjacent stitch and pull up the yarn, closing the hole. Be sure to keep the tension consistent with the rest of the stitches. 

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http://sweaterscapes.com/intars.htm