Hi and welcome to Knitting Help.
It's a combination of wandering or snake cables. Instead of crossing the cable knit stitches, you move the 2 knit stitches over the background knit stitches. There's purl stitches between half the cables. I couldn't find the exact pattern but these patterns show you the idea of the wandering cable. You could set up several next to each other for the scarf.
http://www.ravelry.com/patterns/libr...an-style-scarf
http://www.ravelry.com/patterns/library/snake-scarf-2
Were you thinking of stripes for your pink and blue scarf or something else? Any particular weight yarn?