Promoting Kindness

In the article "Creating a Culture of Kindness in Your Classroom",  Shari Carter discusses several ways to promote kindness between students and teachers. My students struggle with being kind to one another, so we tried "Secret Encouraging Pals" for about 5 weeks. Each student had another student that they were supposed to do something kind for over a period of about 2.5 weeks. I think it worked well, I would like to do it again next year.

What do you do to promote kindness in your classroom?