For older preschoolers, playing a game of robot tag can be an exciting way to get out excess energy. In a large but contained area, such as a schoolyard, designate one child as the robot. Moving with robot-like motions, the child should try to tag a classmate, who will then turn into the robot and have to tag another classmate.
To help students learn about diversity in a way that interests them, have each student invent a special kind of robot with a different skill: for example, a robot who can fly, or a robot who washes the dishes. Have each student draw a picture of her robot, and help her write a list of the robot's characteristics without ever mentioning the special skill explicitly. Turn this into a guessing game by having each student talk about their robot in front of the group.
In a twist on Guess the Robot, have each student create and wear a robot costume for his favorite kind of robot. Provide different masks and costumes in metallic colors, allowing each child to pick up several elements and create his own outfit. This is also a good guessing game, where the student talks about his special skills in front of the class.
You can use many different tools to construct robot crafts for your students; by adding in elements such as who can use the most shapes to draw a robot (or to make one using pre-cut shapes), or who can use the most pieces of old metallic junk (large enough so that the children won't swallow them), you can also make these crafts into competitive games. So that all children are included, consider having awards and prizes in different categories, such as Biggest Robot, Most Creative Robot, and so on.