The Antiphons for Holy Cross Day are really beautiful. From Brotherhood Prayer Book, page 363:
O mighty work of mercy! Death died when Life died on the Tree.
Save us, O Christ our Savior, by the power of the Cross: Thou who savedst Peter perishing in the sea, have mercy upon us.
Behold the days come, saith the Lord, that I will raise unto David a righteous Branch.
God forbid that I should boast except in the Cross of our Lord Jesus Christ.
And being found in fashion as a Man, He humbled Himself and became obedient unto death, even the death of the Cross.
We adore Thee, O Christ, and we bless Thee, because by Thy holy Cross Thou hast redeemed the world.