Facial Warm-up
There is a popular vocal warm-up in which a singer loosens up his face for singing. The exercise consists of making your face a pumpkin (wide-open mouth, big eyes and stretched out) and a prune (scrunched up mouth, shut eyes and condensed). To make a game for kids, create a series of different fruits, vegetables or animals for kids to make their faces when a leader calls out. For instance, a tomato could have puffed-out cheeks, a lemon could have pursed lips and wide eyes and a monkey could have lips sticking out underneath the nose. Let your kids come up with some of the ideas and, then let them loose.
Mirror Image
A common theatre game is to have two people stand facing each other as if there is a mirror between them. The two across mimic one another's arm and body movements, letting the movement happen naturally so that one person is not truly leading the other. This can be done with just the face. When telling your kids the rules of this game, stress that the facial changes should happen slowly. Having two kids do the game while the others watch will produce a lot of laughter from the rest of the kids.
Frozen Face Scenes
Have two or more of the kids do a scene set anywhere about anything at all. The only restriction is that each kid has a particular face that has to stay stuck the entire time. The scenes are the funniest when one child is talking about something in an emotion completely contradictory to his face. For example, if a kid has a sad face and says he loves life and is so happy. This can't help but generate a few laughs.
Facial Emotion
The game is similar to "Frozen Face Scenes" in that the kids are doing improvised scenes in front of their other friends. In this game, different emotions connected to different parts of the face are written down on slips of pieces of paper and scattered throughout the playing area. For instance, these slips of paper could say "beady eyes" or "annoyed nostrils" or "sad lower lip." Every few lines, instruct the kid speaking to pick up one of the pieces of paper. He then needs to inherit the facial feature. Create as many different facial features as you can think of. The fun starts when one kid has several different features compounded on top of one another.
Straight Face
Just as fun as making a funny face, attempting to keep a straight face can be amusing for a bunch of laughing kids. Have one kid be "it" and sit down in a chair. The kids take turns attempting to make the "it" laugh, snicker, smile or do anything that would cause him to no longer have a straight face.