This is one of a set of related motion backgrounds I created for a worship series that used old letters as its core visual metaphor. The series, called "The Invitation," focused on God's love for us while we are sinners. The core text is the prodigal son. The old letters evoke an emotional connection to a bygone era and suggest that, like a letter from home received in the mail, God is as a father calling us back.
This also shows an example of how to extend the series brand into songs rather than use the same old blobs of color behind lyrics.