How FUN! My master bath has a nod to a beach theme too. Here are some sites to get you started.

https://www.thisgrandmaisfun.com/16-nautical-diy-projects/

https://www.pinterest.com/seabags/nautical-decor-diy/

https://hative.com/nautical-decor/

I have an apothecary jar filled with sea shells and sand dollars from Pismo Beach. You can string sea shells up like garland and add them to your curtain valence or use as tie backs. You can make votive holders with sea shells, just glue onto dollar store containers.

You may find my beach themes bathroom update helpful https://www.hometalk.com/22600625/thrifty-bathroom-update-beach-inspired

Thrifty Bathroom Update - Beach Inspired

Hi ViKi - This is an old post so please excuse the quality. But hope to give you some inspiration of something you can pick up at a yard sale and turn into a beautiful piece and Pottery Barn knockoff. Good luck! Hugs, Holly

https://pinkfortitude.com/oar-copy-diy/

here are lots of ideas videos https://www.youtube.com/results?search_query=diy+beach+themes

I have a beach-inspired look in our guest bathroom. Here are a couple of photos of simple pieces you can DIY, or may inspire some ideas of your own. Have fun!