I bet everyone has a rib scarf pattern.
Here is mine.
Using 8mm needles and 8 ply acrylic (or DK yarn), cast on 30 stitches.
First Row: Knit 4, *purl 2, knit 2* to last 4 stitches, Knit 4.
Second Row: Knit 2, Purl 2 across row to last two stitches, K2.