I have mastered the art of the super-high messy bun paired with a headband. It's pretty much the only position in which my hair resides on weekends. And nights. And whenever I don't do my hair for work. And some afternoons when it's hot. Saturday mornings when I don't feel like, ahem, showering I'll just tousle hair into said hairstyle and slap on a pair of dark glasses. There! Ready to run errands*!
*Going to 7-11 for a morning Gulp is considered an errand, right?