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 shadow box to display small items.
Do organize items below the sink in stackable bins that can fit around existing plumbing pipes. Label bins for soap, cleaning wipes, first aid essentials, and grooming products for each person who shares the bath.
Here a deep drawer can safely hold a hot flat iron and other primping tools after use. Stainless-steel canisters allow these beauty tools to cool safely inside the drawer as well as house brushes, combs, and a hair dryer. Could easily be a DIY project.