This might be a good way to practice cables? Before tackling a sweater?
Matilda scarf - free pattern http://thecakeplate.blogspot.com/2008/07/matilda-winter-scarf.html
Celtic Cable Scarf - This is knit but wanted to keep it as an example. Maybe when I get better at cables, I figure out how to do this in crochet.
Braid Cable Reversible Hiking Scarf by Jeanna Quinones - free from Ravelry http://www.ravelry.com/patterns/library/braid-cable-reversible-hiking-scarf
Free knitting pattern for Braided Cable Scarf and more scarf knitting patterns
Knitted - Lupin scarf - Free pattern - Printed
Guys easy cable knit scarf pattern. Maybe when I get more experience this will be my first Cable scarf
Beautiful Cable knit Scarf and lots of lovely scarf patterns for free
warm cabled knitting scarf pattern