Some of my favorites:
From St. Francis of Assissi-
Lord, make me an instrument of your peace; where there is hatred, let me sow love; where there is injury, pardon; where there is doubt, faith; where there is despair, hope; where there is darkness, light; and where there is sadness, joy. O Divine Master, grant that I may not so much seek to be consoled as to console; to be understood, as to understand; to be loved, as to love; for it is in giving that we receive, it is in pardoning that we are pardoned, and it is in dying that we are born to Eternal Life. Amen.
Prayer for Peace and Justice (The Upanishads)-
Lead us from death to life,
From falsehood to truth.
Lead us from despair to hope,
From fear to truth.
Let peace fill our hearts,
Our world, our universe.
Let us dream together,
Pray together, Work together,
To build one world
Of peace and justice for all.
This is my personal modification on the Druid's Prayer-
O Divine One
Grant thy protection
And in protection, awareness
And in awareness, inspiration
And in inspiration, guidance
And in guidance, deliverance
And in deliverance, peace
And in peace, the vision of the All-Song
And in that vision, the love of the Song and all in it
And in that love, the love of You
The Divine One
And all goodness
May the blessing of the Uncreated One,
The Creative Word,
And the Spirit that is the Inspirer
Be always with us
And so it is