The typical Parisian bathroom has floors composed either of wood, tiles, or marble if you're aiming for the most luxurious bathroom possible. Parquet wood floors are a good choice here because they inject some warmth into the space, giving it texture and personality. However, tiles tend to be more popular nowadays since they are far more impervious to moisture. In France, cement tiles are seen as a perfect option because they are easy to style in any color or shape you would like.
Of course, marble is the ultimate choice for accompanying Paris bathroom decor, and there are other tile choices besides such as mosaic tiles, and terracotta tiles, and they all come with their own host of advantages and disadvantages. At the end of the day, the tiles and marble are going to be more durable and moisture resistant, but their high-quality hardness can also make them a bit colder than wooden options.
The definitive colors of a Parisian-style bathroom are typically soft neutral colors such as shades of cream, ivory, vintage white, or even beige. This is a dominant color that is usually present throughout the bathroom. In addition to this, a typical Parisian bathroom will offset these dominant colors with a more vibrant set of colors such as brown, copper, or even gold. A good Paris bathroom decor idea would be one dominated by beige white marble that is offset with gold metal accenting in the light fixtures, bathroom faucets, door handles, soap dispensers, mirror lining, etc.