I used the "Trumpet Voluntary in D" by Clarke for my wedding processional. I did *not* want the Bridal Chorus (Here Comes the Bride) by Wagner -- no way, no how. I don't like that piece to start with, and it's so overused. The "Trumpet Voluntary," however, is a beautiful piece and while recognizable, is not overdone.
My recessional was the hymn "Crown Him with Many Crowns." The tune is "Diademata" by George J. Elvey, and was composed for the words it accompanies. That’s not always the case, but was with this hymn.
Clarke's "Trumpet Voluntary" is such a great piece and I always enjoy hearing it.