Z, before I launch into shameless self-promotion, I have to say that my quintet was in the same boat a few years back. We felt like we had played the same stuff and wanted something new. We wanted new material not just for church services, but also brass/organ arrangements that could be performed in a concert setting.
Here is a partial list of some music I have arranged and published:
Brahms, Variations on a Theme by Haydn (all 8 variations and finale)
Brahms - Choral and Finale (shorter version of the Haydn variations)
Mahler - Finale to Sym #2
Mahler - Finale to Sym #3
Mahler - Urlicht (Horn solo or Alto solo)(coming soon! next two weeks)
Saint-Saens - Maestoso from Sym #3 ("Organ" Symphony)
Parry - I Was Glad
Mascagni - Easter Hymn (not just for Easter)
Mascagni - Intermezzo
Chesnokov - Salvation is Created
Berlioz - Hosanna (from Requiem)
Franck - Grand Choeur in C (from L'Organiste)
Handel - March Grand Choeur (from Joshua, made famous by Diane Bish)
Whitney - Processional Grand March (Whitney was a founding member of the AGO)
Widor - Toccata
Almost all of these arrangements are available thru Robert King or the Organ Historical Society (on-line catalog, under sheet music for organ and brass ensembles). Or you can order directly on my website
http://www.dorm40music.com" target="_blank" target="_blank" target="_blank, where you can also see a sample page and listen to an audio of the arrangement (the Brahms, for example, was recorded by the Triton Brass at King's Chapel in Boston). If you purchase on my website, we are having a sale all day 12/23. 20% off everything, just enter the discount word SANTA on the Checkout page.
I hope you find something you like. Enjoy!