Beach Bathrooms can provide a sanctuary of solace that reminds you of the ocean and salt air.
If indeed the bathroom has a window it will be covered by a window treatment with shells or starfish...
Of course, only something nautical will suffice.
Once again I'll provide the picture of my daughter in law's bathroom...she really likes nautical and it suits the guest bathroom well.
If you like tile, I'm sure you will be able to find a nautical theme for the walls...
Perhaps just a splash of tiles (no pun intended) over the walls or to break up the wall, just a band of tiles.
The floor of the bathroom should be able to cope with sand...perhaps a throw rugs or rugs scattered around.
These will pick up sand and then just shake out.
Tiles will do well on the floor also or you can choose to go with seamless linoleum flooring or square tiles.
Just remember if you choose anything you have to stick on...BEWARE THE SAND!...any sand on the stick on tiles and they won't stick properly.
Anything that you don't use everyday can be stored in baskets or containers. My bathroom is very small and I have to put items on shelves whenever I can.
If you have overhead beams, hang baskets and fill them up. If you have a cabinet around the sink, put stackable shelves and drawers to consolidate things.
These are readily available in stores and even at garage and yard sales.
Your beach bathroom should have the atmosphere of the beach. A neat trick with paint you can do is add sand to the paint for a sandy texture on the walls.
Choose colors that are light and bright...especially if the bathroom is small. Dark colors make a small room feel closed in.