You will need:
A picture of Christ:

Discuss these questions:
What is a testimony?
How do we get a testimony?
How do we strengthen our testimony?

Read John 6:66-69
What does Peter say when Jesus asks if he will leave?
Why will Peter not leave Christ?

Read Moroni 1:2-3
How can you tell that Moroni has a strong testimony of the Savior?

Get out the picture of Christ. Whoever is holding the picture bares their testimony about the Savior and passes it to someone else when they are done. Keep going until everyone has a turn to share their testimony.