I love a nice fat lace that still keeps one warm. This is an easy stitch I felt like practicing. It has a strong diagonal warp though, so if you want to keep your lace lines straight, you'll have to do some heavy duty blocking.
Worked over a multiple of 3 plus 1 stitch. Row 1: K1, *YO, K2tog* repeat **to end. Row 2: Purl across
Couldn't be simpler, right? If you want to do this as a whole scarf, I recommend an extra 2-4 stitches on each end in 1x1 ribbing to give it structure.