I thought about a phone case that I could hang around my neck but the phone I have now is too heavy to wear that way. I agree that most cozy type knits seem a bit silly. Better to use those bits of yarn and make a colorful hat or mittens to keep someone's head or hands cozy, someone who can't make or buy their own.
ETA Learning how to answer this silly smarter-than-I-am phone was bad enough w/o a cozy. I've started to think my phone is so smart, it's stupid.