For me, nothing is as satisfying as a quick pair of fingerless mitts. Pair them with a hat and I’m over the moon. You can use pretty much any yarn you like. After all, what’s the worst thing that can happen? The hat might lack sufficient elasticity to hug your head (or give you that dreaded hat hair). Or the mitts might stretch out or pill over time. But by then you’ll be on to the next hat, the next set of mitts.