My primary kids love using Rocket Balloons. When we are reviewing songs, the stronger they sing the more I inflate the balloon. At the end of the song, I release the balloon. The children sing REALLY well and have a lot of fun with this activity. Good for weeks when it is hard to get the kids to focus!
This video shows a Rhythm Stick Pattern activity for the Primary Song I Will Follow God's Plan from a Primary Music Workshop given by Sharla Dance.