The straight curtain rod will need a shower or bathtub that is design in three-wall space only, even if it can be install in regular space, it will spend a lot of space that can be useful for other things, so it is not efficient. 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.