Here is a prayer for thanksgiving by Martin Luther...
God, the Father Almighty, maker of heaven and earth, You looked upon all that You created and declared it good. Grant that we, this day, might regard Your creation with the same esteem and appreciation, seeing You at work in every daily operation. Help us to give thanks as we recognize Your loving work in all abundant blessings. Most of all, let us see not only Your creation, but also its redemption, through Jesus Christ. Amen