I finished knitting a dishcloth using a moss stitch this afternoon using cotton yarn.
Cast on 40 stitches.
Row 1: Repeat knit stitch purl stitch across all stitches to end.
Row 2: Repeat purl stitch knit stitch across all stitches to end.
Repeat rows 1 and 2 until piece measures the size you want ending with row 2. Bind off all stitches in knit. Weave in loose ends.