I loved the ceiling medallion in the dining room that came with the house. It just never really stood out against the white popcorn ceilings.
(I am sure if I scour Craiglist ,that I could remedy that situation.)
I didn't even bother to tape the area off. I just used a good angled brush with Kilz exterior black paint. (It claims one coat coverage, however you can see that's not the case)
Good brushes make it capable to paint a straight line without having to tape first.
I applied a second coat of black and dry brushed acrylic craft paint in burnt umber, with the same angled brush.
I used a sponge brush to highlight the raised areas with gold (acrylic craft paint).