I share this piece specifically because I know from past experience it's the sort of piece that so many organists (amateur and professional alike) seem to particularly enjoy playing for fun or for church/recital. A big "trumpet piece" that is not difficult:
Lynn Trapp: Fanfare and Processional
http://www.contrebombarde.com/concerthall/music/21226Published by MorningStar Music (morningstarmusic.com)
It also serves as a good demo of the extended version of the new Armley Schulze sample set—particularly what is possible in terms of the Ch. Trumpet becoming a "big solo reed."