Our worship band has a violinist on occasion. They just work it in. He can rock that thing too, its pretty awesome. Not every song can probably be adapted for cello but try using violin music and work with it until it works. Like i just did a net search for Jars of Clay song Flood and it has violin music available. If you are a cellist you really need to listen to some modern cellists. The cello can ROCK? Listen to YoYo Ma or this guy http://listen.takenobumusic.com/ click on the albums and you can listen.