Clay Jars

This will work for either a narrative sermon on Gideon and the Midianites (Judges 7)  or an exposition on 2 Cor 4.  Have several clay jars (vessels) of various shapes, sizes, qualities sitting on a table on the platform.  Begin and progress the sermon with a hammer in hand and refer to neither the clay jars nor the hammer.  As the sermon progresses,  and the analogy dictates smash the jars to represent the broken vessels that we must become to be used by the Lord for His victory in our lives.