Radiators are so common in British homes that the market there is flush with a wide array of choices, for all styles of interiors. We are particularly fond of the offerings from UK company Bisque—in particular, the Classic Radiator, which is "equally at home in Victorian drawing rooms and state-of-the-art kitchens, moving easily from period homes to contemporary interiors," according to the company. For those of us on the US side of the Atlantic, Bisque's multi-colored models serve as inspiration to paint our own radiators (high-heat spray enamel paints are recommended).
N.B. For step-by-step instructions, go to This Old House's video How to Paint a Cast-Iron Radiator.