Check out the tutorial: DIY Bathroom Mirror Storage Case /istandarddesign/
DIY drawer organizer project ~ 48" wood laths super-cheap at Home Depot, & the store will cut them for you. So simple it's not even really a tutorial :-) Would also work to make a shadowbox to display small items.
Small Bathroom Storage Ideas
Nice 88 Rustic Decor Ideas for Your Bathroom. More at http://88homedecor.com/2017/09/12/88-rustic-decor-ideas-bathroom/