The materials that people usually use for their L shaped curtain rod is metal, however, you can also use iron or steel. It depends on the overall décor of the bathroom. Metal curtain rod that is finished with white color is good for more minimalist type of bathroom. Your bathtub will look more elegant and classy if you decorate it with curtain rod. There are several types of curtain rod; there are ones that are plainly straight, there are ones that has L shape. This L shaped curtain rod is very famous because it is good to be installed in a small or even spacious bathroom. Architecture.