One of my favorite quick knit scarf patterns is to use a simple seed/moss stitch. Here's a great free knitting pattern for a seed stitch scarf if you'd like to learn how!
Tasseled Garter Stitch Color Block Scarf Pattern - A Quick Cozy Knit Gift - Flax & Twine Autumn winter wardrobe essential, chunky knit scarf with tassels
Such a simple knit scarf pattern has never looked so professional. The Lightning Fast Mistake Rib Scarf is just the next project for those of you who love making scarves, but don& necessarily love the homemade look.