Noticed recently: ceiling medallions (both vintage and new) used as decor.

Above: A Scandinavian living room with a vintage plaster ceiling medallion, via Vita Tankar Cecilia.

Above two photos: A restaurant installation by Toronto-based Commute.

Above: Classic Ceilings offers a wide range of wall and ceiling ornaments, including a good selection of paintable high-density furniture grade polyurethane medallions; prices start at $22.20 for a 10-inch Arstyle Medallion.