Actually the style of the western bathroom are more different rather than another bathroom, people in here are like design it with dark color and for the concept of it are too elegant, luxury, and so on.
In here I explain you two style of it are classical and modern, you can mix and match the concept with the color of its. For the classical style of its, you can paint the wall with dark color of brown.
For the tub you can choose the long classical tub with white color of it, for the lamp you can used candle to make its room classic.
For designing the floor, you can choose ceramic without motive and the color of it is light brown
Another idea is you can design the wall with putting the wood on it, for the floor you can used wood too, but for the tub you can used the circle style of it with the dark color of brown to make it more classical.
In modern style you can mix and match material of wood and ceramic, for the wood it can be as the furniture and the ceramic you can design it in the wall and the floor.
For the wall you can put the ceramic with the motive is small square with three color are black, white, and grey.
The other idea is you can put two different colors in the wall like green and white or dark and light purple color, for the mirror you can choose simple circle style which it hanging on the wall and for the color of it you can choose the same color as the wall, or you can use different color. For the color of the tub you can choose the oval style and for the color is cream. Actually you can put the small rack on the bathroom and so on. Another idea is you can design it room with dark blue color as the wall, tub, and the ceramic on the floor with the motive is bubble. For the wall you can design it with the ceramic too and the motive is floral, and for the mirror you can choose the classical style of it.