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. To get this kind of L shaped curtain rod, you can buy in any place that serve and provide bathroom furniture. However, if you want to be more efficient and also creative way, you can create your own curtain rod by using simple materials. Architecture.