The main objective of decorating a rustic atmosphere, is to bring nature into the home, and this applied in particular to the bathroom gives a surprisingly good result.
The main feature is to have furniture with a rustic finish that look like they were unfinished, or have a textured wall, and if you also have a small window, even better.
In this image, the wooden walls and furniture give a completely rustic view.
Bathroom walls and rustic wooden furniture and tiled floors.
One of the hardest parts of decorating a rustic bathroom, is to find the right material, but it is best to use marble tiles, slabs or pieces of stone, ceramic or brown, this gives an elegant look to the room.
Lined with stone walls and wooden ceilings.
The combination of materials also gives very good results, as seen in this bathroom, tiles were used to coat ceramic and wood walls.
However, if you prefer a material that make your bathroom completely rustic look, the wood used to coat the walls helps.
The best colors for a rustic bathroom are those that can be found in nature, ie, brown, green and all ranges.
Other two details that ensure success in a rustic bathroom decor is the use of rough textures, which is very good especially if you have wooden ceiling beams visible.