Here is a short refrain that was composed for Advent 2022, but I think we only sang it at Pillar once or twice, so it will probably feel new! The text is drawn from a fifth century liturgy called the Gelasian Sacramentary.
O Lord, incline your merciful ears to our prayers and enlighten the darkness of our hearts by the light of your visitation; through Jesus Christ our Lord. Amen.
Source: Gelasian Sacramentary, fifth century, Advent 3.
Below is a lead sheet if you want to play and sing along as well as a rough demo recording for listening.