I hesitate to call this a 'pattern', but here's what I did:
About 200 yards of bulky yarn - hand-dyed semi-solids are perfect for this
16" or 24" US 10.5/6.5 mm circulars
3.5 stitches per inch in stockinette
Cast on 126 stitches. I used the long-tail cast on. This gives a 36" inch cowl.
Purl 1 row.
Knit 1 row and then join. (I like to knit a couple of rows first to make it easier not to get a twist. The tiny seam is easy to sew up with the tail.)
Knit until it's tall enough (mine are about 8 or 9") or you're out of yarn (or patience)
If you're using multiple colors, just change whenever you run out. No need for a beginning of round marker.
Cast off loosely. Weave in ends.
I like to wear it with the reverse stockinette side out.
On this second cowl, which was made up of leftovers, instead of weaving in the ends where I changed colors, I tied little bows on the stockinette side (WS) and secured them with a few stitches with a needle and thread. It's so hard to weave in ends with bulky yarn and I think this is a cute look too - although I consider the reverse stockinette side the right side.
I went yarn-crawling yesterday and bought yarn for another one -
it's perfect for working on when I need a break from more intense projects or when I'm just too tired to do anything but knit mindlessly in the round.