The term curriculum is not as restrictive in preschool as it eventually becomes -- where it applies more strictly to subject matter and becomes separated as an issue from behavior. Preschool children are learning how to behave socially as a primary matter in preschool, so the way that emergent matters are handled is as much a part of the curriculum as the testable didactics. Modeling, routines, redirected activity and conflict mediation are all part of a nonviolent preschool curriculum.
The concept of peace is complex for preschoolers, so it is important for them to be familiarized with the word through repetition and association with perceptions that reinforce what peace means. It is the absence of conflict, but also the presence of friendship and cooperation. Pictures and collages that show people smiling, holding hands and otherwise being together harmoniously can be constructed collectively, while making the letters to spell the world peace. Multicolored figures emphasize the acceptance of diversity, and peace symbols can be incorporated.
Preschool children are not too young to learn a few phrases in a foreign language. Teach them all how to say "I love you" and "peace" in English, Spanish, French, Russian, German, Swahili, Mandarin, Japanese, Hindi or any other language you choose. This can also be incorporated into a map study of the world. Songs about peace are fun and tend to stick with the children as songs do. Songs about peacemakers -- like Mother Teresa, Mohandas Gandhi and Martin Luther King Jr. -- introduce history into the curriculum with peace.
The Preschool Pledge of Nonviolence, created by the Institute for Peace and Justice, is a seven-part pledge that can be systematically and cumulatively taught as part of each day's teaching until all the students have committed it to memory. The pledge begins with the declaration, "Making peace must start within ourselves and in our school. We commit ourselves as best we can to become nonviolent and peaceable people." The parts of the pledge include "respect myself and others," "say how I feel," "listen to others," "forgive," "respect the environment," "play safely," and "be a strong and fair friend." Each of the parts of the pledge contains further verbiage; for example, under "respect myself and others," it says, "To respect myself and other people and to keep from saying or doing mean things to others."