A prayer I like for Trinity Sunday is:
Father, who sent your Word to bring us truth and your Spirit to make us holy. Through them we come to know the mystery of your life. Help us to worship you, one God in three Persons, by proclaiming and living our faith in you. We ask you this, Father, Son, and Holy Spirit, one God, true and living, for ever and ever. Amen
For worship, Creating God, Your Fingers Trace is a Trinity Sunday hymn with the text based on Isaiah 45:7 The auther (Jeffrey Rowthorn) uses present participles to draw our focus to a God who is still working in our world.
And how would you explain the Trinity to children? You could try using a mobius strip. Children would even love making their own!
Cut a length of adding machine tape — about 30 inches long — for each child. Show the children how to write the words "God" and "Jesus" on their strips spaced one on each end of the same side. Then flip the strip over — so the words are face down — and upside down. Then write "Holy Spirit" in the middle. Turn one end of the strip 180 degrees and fasten the two ends together securely, taping both sides. Twist the paper once and bring the ends together so that the paper forms a continuous loop (with one twist that won’t be very obvious). Tape the ends together. Now run your fingers over the paper from the word "God" to "Jesus" and keep on going. The word, "Holy Spirit" that started on the other side of the paper, is now on the same side as God and Jesus. If you fiddle with the paper, you can shape it into a triangle — and God, Jesus, and the Holy Spirit can all be read. What will the children say these strips tell us about God the Father, God the Son, and God the Holy Spirit?