The best gift is to treat every person you encounter the way you would like to be treated.
Many years ago when I was teaching, I noticed something interesting about my students around Christmas time.
I was a high school Chemistry and Physics teacher and taught mostly Juniors and Seniors. At the same time, my wife was a 4th grade teacher. Each year at Christmas time she came home with bunches of little gifts from her students. It was not cool for Juniors and Seniors to give gifts to teachers so I usually got only about one or two gifts. What I noticed is that the students who sheepishly handed me a gift usually after class on the last day before the holidays, were teacher's children.
Here is a great Christmas gift story for teachers.