Print the PDF containing 24 worship phrases from the psalms, and cut them out. Fold the phrases up and stick in balloons, which you inflate (for best result with helium). Attach the balloons to different places in your worship space (creates a great celebration atmosphere as people arrive). In the midst of a time of sung praise, encourage people to pop their balloons and read out their prayers of praise with a loud voice. [Don't do this activity if it's likely that you will have babies / small children present who might get scared - their parents won't thank you!]