First if you have anything unique in your bathroom, you can still used it as it will become a great thing that will make your bathroom appear more unique. Thus, you can still maintain the foundation of your bathroom when using this design.
If you feel that your bathroom is too small, you can also add mirrors all over the walls which will make the bathroom appear bigger. This also help for the natural light to spread evenly around the room and brighten the space more.
When it comes to the color schemes you need to carefully select it since different color scheme will bring out different feeling on the bathroom. Do not worry as there are various farmhouse master bathroom decorating colors that you can use. You can also used more unique color as the accent color when necessary.
If you want something more authentic and classic then you can try to add rustic element to the bathroom. Something like antique furniture or fixture with antique design can also be used to add more rustic element to your decoration.
Another decoration that you might want to add is arts, but you should make sure that the art is suitable with the farmhouse theme. There are a lot of farmhouse themed arts with beautiful classic style or more modern approach that you can always use to decorate the space.
If you want another unique approach then you can try to use wallpaper around the bathroom for additional pattern. This will make the farmhouse master bathroom decoration appear richer and also add more warmth to the design. Here are some wonderful ideas to use.
image source : pinterest.com