Scrappy scarves are great. I started making them a while ago, originally to use for yarn bombing, but it turns out they are awesome for scarves as well, so I've started making them to sell. (Don't hate me, I need the money! For...more yarn.)
They're very relaxing to make, plus they use up leftover tiny balls of yarn that wouldn't get used otherwise. Plus, when they get long enough, I can use one end as a scarf while I'm knitting the other end! Which makes me feel like the coolest person ever.
This blue and purple one is currently available on etsy!