Had another idea. If you're into the classics, you could take a passage from a Mass or other devotional piece and use that. For example, 'And he shall feed his flock like a shepherd' from Handel's 'Messiah'.
Or, you could take one of the prayers from the service, say, the Creed or the Gloria.
One of my favourites is (yeah, OK, it's a Catholic one, but the sentiments are universal)* the Magnificat:
My soul magnifies the Lord, And my spirit rejoices in God my Savior For He has regarded the low estate of His handmaiden, Behold, henceforth all generations shall call me blessed. For He who is mighty has done great things for me, and holy is His name. And His mercy is on those who fear Him from generation to generation. He has shown strength with His arm: He has scattered the proud in the imagination of their hearts. He has put down the mighty from their thrones, And exalted those of low degree. He has filled the hungry with good things; And the rich He has sent empty away. He has helped His servant Israel, in remembrance of His mercy; As He spoke to our fathers, to Abraham and to His posterity forever.
Glory be to the Father and to the Son and to the Holy Spirit. As it was in the beginning, is now and ever shall be, world without end. Amen
- Geez, I think I did a pun. Go me!