I used about one and half skeins of Loops & Threads Cozy Wool in Pewter. This is knit in the round with size 15 circular needles.
Co 72 sts, and join without turning
Rows 1,2,3,5,6,7: knit
Row 4: *st 2 sts to dpn, hold to back, k2, k2 from dpn, k4; rep from * to end around
Row 8: *k4, sl 2 sts to dpn, hold to front, k2, k2 from dpn; rep from * to end around
Repeat rows 1-8 until desired length. After a row 3, bo loosely.
Fasten off, and weave in any remaining ends.
My finished cowl is 13" tall and 26" around. I like to do the cables without the dpn, so you could do whichever one makes you more comfortable.