Free on Ravelry, "Zag Edged Scarf" by Laurel Brandt. This scarf is a simple lace edged, symmetrical and gradually sloped garter stitch triangle or trapezoid -- your choice of shape. Whether you make a triangle or trapezoid will depend on your desired width and length. You make this choice as you knit, so there is no need to swatch !!
This asymmetrical shawl is worked in garter stitch with a simple k2tog and yo row spaced as desired or to make a clean transition between colors. I cast this on with 1/3 skein of gray and then pared it with a mossy chartreuse but just about anything could work here, from our Wee Skeins to a hand painted yarn. It is also a great stash busting project for those leftover bits and bobs.