Every time I volunteer in my kids’ classrooms, I leave with two things: a headache and a whole new level of awe. Ten plus years of having school-aged children, along with the discussions I’ve had with family and friends who teach, have taught me that a teacher’s work doesn’t end when the bell rings. So if there’s a teacher for which those words ring true, here are 10 holiday gift ideas for teachers that are sure to bring them Christmas cheer: GIFT CARDS This is hands-down my …