Chorusstorming

It's like brainstorming, only you're looking for choruses and hymns.

If you know the sermon is more specific, you find a webpage on the subject, or you look at the chapter in the Bible.  You then write down every single chorus or hymn that comes to mind as you're reading.

I would say, try not to be too obvious, else it could end up cliched.  An extreme example would be The Lord's my Shepherd when the sermon is on Psalm 23.  Think about what Psalm 23 is saying, so, faith and trust, and think about choruses that invoke faith and trust.

The church is starting a "series" of sermons, and so far, I've gathered about 9 "chorusstorming".  I'll definitely try this again.