For resolving conflict, we're a big fan of I-Messages, intentional language that teaches kids to recognize emotions, both in themselves and others. I-statements—"I feel ___ when you ___"—allow children to identify their feelings (and the feelings of their peers) instead of blaming others.
And finally, Peace Paths are a step-by-step guide for students to follow when resolving conflicts. "I imagine [Janie] felt ___ when ___ happened." You can paint it right on your playground for easy access.