Here's a quick little poem-prayer I wrote back when I was in college:
May the peace of Christ be with you,
In your comings and in your goings.
May the True Spirit direct the journeying of your heart,
And may His loving care enfold you.
May the Living God be your shield on the day of battle,
And may He defend you with His strong right arm.
Now and always, wherever you go.
Now, and always, wherever He leads you.