The khamsa is a good luck symbol. It keeps away the "evil eye", and can be worn as an amulet around the neck or a wall decoration. It is in the form of a hand, with decorations on the palm and the fingers. "Khamsa" means five (fingers) in Arabic, and the first khamsas came from Morroco in North Africa.
Khamsa designs can be made easily in the class room by drawing around the outline of a hand. An adult hand is bigger and easier to decorate, so maybe it is best to precut the outlines on coloured paper, particularly if these are younger children. The paper shaped hand can be decorated with cut out designs, colored paper shapes from craft punches, or painted.