Here's some: https://www.hometalk.com/3156543/farmhouse-bathrooms
Pinterest is my BFF when it comes to finding ideas! Here are some farmhouse bathroom ideas https://www.pinterest.com/search/pins/?q=farmhouse%20bathroom%20ideas&rs=typed&term_meta=farmhouse%7Ctyped&term_meta=bathroom%7Ctyped&term_meta=ideas%7Ctyped
Here is some inspiration https://www.hometalk.com/8776100/budget-friendly-farmhouse-bathroom-remodel-reveal
And some more https://www.hometalk.com/3156543/farmhouse-bathrooms
Shiplap and beadboard both help create the look.
Here is a tiny bathroom we just finished https://www.homeroad.net/2019/01/renovating-tiny-bathroom-in-farmhouse.html