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One of our fun routine assignments is called Praise Pockets.  Students designed their own little pockets to hang in the classroom and every so often, students will compose short compliments to deliver to each other's pockets.  It's a quick way to promote teamwork and comraderie.

Another feature of these compliments is that they have a content goal as well.  For example, if we are studying metaphors, I may ask students to write a compliment for a classmate that includes a metaphor.  Yay for being nice!