I knitted a cable scarf last year that I gifted. I used a cable pattern from a sweater pattern that I liked and just added a border stitch on each side and it turned out great. I used a celtic knot cable stitch.
You can do an Internet search to find that cable stitch pattern. It turned out really nice.
So, don't limit yourself to 'cable scarf patterns'.. just look for cables in other knitting and think of it being used as a scarf instead.