About once a month, I play my violin in church. I always play arrangements by Ashley Hall, who is in my ward. He has a website where you can go to listen to & download his arrangements for choirs, instrumentalists, duets, etc. All his music is free and he even has a link to other free sheet music websites ... great resource! If you're looking for a nice musical number, take a peek at his site.
PS Ashley's arrangements are very simple & easy to put together which is nice because they can be used by a variety of people and you don't have to spend countless hours practicing.