Mason jar one is my favourite, & definitely doable 12 Bathroom Organization Ideas. A few of my favorites: Container Store mini bins for eyeliners and lip liners, over the door shelf, and magnetic strip.
Sliding Barn Door locking latch to ensure privacy for bathroom doors. This will keep the door from being pushed to either side when closed. Be sure to leave a few inches of door on each side so noone will catch an unintended glimpse. Don't install latch on the edge of the door. Also the door needs a notch to open the door from the inside.
The ultimate bathroom accessory: a cupholder for your bath wine or shower beer.