Random Acts of Kindness. Good template and could be modified for use with high school students.
Free printable compliment cards to teach kids about kindness. This is a fun and free random act of kindness activity!
The Kindness Chain: A New Kind of Linky Love! An oldie, but goldie! A fun way for families, classrooms or groups to encourage kindnes and compassion.
'YourKids' Teacher: Erasing Meanness