I absoloutly know this is not the Godly play model (except of course white circles and a dove) but needed an example of the Trinity for the context of the Pentecost story. Simply placed the three circles on the floor, pointing to each circle saying this one we will think about God the Father, God The Son- Jesus, this one God The Holy Spirit. Then placed each object on top,
God The Father: We often think of God The Father as the creator, he created everyone and the whole world with His hands (wooden hands). We also think of Him as the Father, a father who looks after us and holds us in his hands.
God the Son- Jesus: We often think of Jesus as a baby, who was born in a stable in Bethlehem (painted baby stone). But we also think of Jesus dying on a cross for us and then coming alive again.
God the Holy Spirit: We often think of the Holy Spirit, like when the dove came upon Jesus on His baptism.
I am not suggesting this is better than the Godly play trinity example used in the Baptism session- no way. I just felt this was right for this occasion. Check out Wonderful in and Easter kind of way's post on The Trinity