My church had a stack of flyers with this prayer on them in the narthex this morning - I thought it was beautiful.
Prayer After Holy Communion - St. Thomas Aquinas
I thank You, O holy Lord, almighty Father, eternal God, who have deigned, not through any merits of mine, but out of the condenscension of Your goodness, to satisfy me a sinner, Your unworthy servant, with the precious Body and Blood of Your Son, our Lord Jesus Christ. I pray that this Holy Communion be not a condemnation to punishment for me, but a saving plea to forgiveness. May it be to me the armor of faith and the shield of a good will. May it be the emptying out of my vices and the extinction of all lustfull desires; and increase of charity and patience, of humility and obediance, and all virtues; a strong defense against the snares of all my enemies, visible and invisible; the perfect quieting of all my evil impulses of flesh and spirit, binding me firmly to You, the one true God; and a happy ending of my life. I pray too that You will deign to bring me, a sinner, to that ineffable banquet where You with Your Son and the Holy Spirit, are to your Saints true light, fulfillment of desires, eternal joy, unalloyer gladness, and perfect bliss. Through the same Christ our Lord. Amen.