BGVs singing melody
Highlighting certain lyrics or melodies vocally
Your high point lyrically should be your high point melodically
Singing octaves can add a great mix
Brian prefers to have multiple BGVs to add depth to worship sets as it seems to engage the congregation more.
Try flipping the melody around with the BGVs
Give yourself options melodically – e.g. have another leader on the team hit a lower register and then you can jump an octave for the chorus
Another technique for BGVs is to just sing certain words/lines/lyrics, not the whole song.
Not every BGV should have to sing harmony all the time. If you’ve got totally different sounding voices they can sing the same part and it works well.