cupsanddowns is a game where one team tries to turn all the cups upside down and the other team tries to turn them right side up. At the end of the time, whoever has the most their way wins. Simple, inexpensive game that could bring a lot of energy.
These guys made a pretty legit Life Size Angry Birds set up. Youth Ministry Ideas and Games. Youth vs parents have one team build their "kingdom" and they have to protect it with "the word of God" from Satan (the ball launcher team).