The Andalusian Stitch is an easy beginner stitch that I think looks great as a scarf with a self striping yarn. Andalusian stitch creates a really nice grid made up of knits and purls. This stitch is knit in multiples of 2 sts plus 1. The sample that I knit was on US size 7 needles and is made of 13 cast-on sts and 12 rows (or 3 repeats).
Row 1 (RS); knit all sts
Row 2 (WS): purl all sts
Row 3 (RS): *k1, p1; rep from* to last st, k1
Row 4 (WS): purl all sts
Repeat rows 1-4 until you reach desired length. The below swatch is made up of 12 rows or 3 repeats.
Back of swatch