knitPro is a free web application that translates digital images into knit, crochet, needlepoint and cross-stitch patterns. Simply upload jpeg, gif or png images and knitPro will generate a graph sizable for any fiber project.
I'm going to make a sweater using a striped herringbone. Will post the chart when I put it together, but this is what I'm basing it off of. I'm thinking about 6 colours, with different shades of grey and one to two purple colours.