A warm-up game.
Each child is given a small table tennis ball ( other small objects could be used) which they write their name on. The children are given a short time to go off and hide their ball and then return when a whistle is blown to gather again. Everybody then goes off in search of as many balls as possible. Each ball found is returned to its owner. The person whose ball is found last is the winner.
Variation: Instead of names written on the balls other things like Bible characters, colors, sports teams, Books of the Bible... could be written and the person finding the ball then has to guess who wrote on it to return it correctly.