Whether your curtains are new or old, you can easily enhance the style by adding new finials on the curtain rod. Like these round ones with a crackled glass surface.
Bush: Aluminium, Epoxy/polyester powder coating
Screw: Steel, Galvanized
In order to prevent the finials from falling off and causing damage, they should be properly fixed to a curtain rod whose brackets must be securely anchored to the wall.