I would throw some Spanish moss https://amzn.to/2u5Rw35 or coconut mat https://amzn.to/2NyF82l in there and then add a few of succulents like these https://amzn.to/30qoLu8

for a planter idea that is...

For plant display:

https://www.diyideacenter.com/Outdoor-Garden-Ideas/Upcycled-Shower-Caddy-Plant-Display

As shelving:

https://www.pinterest.com/pin/121104677451646590/

Vertical planter:

https://www.dazzlewhilefrazzled.com/shower-caddy-vertical-planter/

Here are some ideas people did with there caddies https://tiphero.com/shower-caddy-uses

Zy

here is something I came up with - you gave me a good idea for my old shower caddy thanks

https://www.pinterest.com/pin/121104677451646590/

Hi, hope this inspires you to using your shower caddy for office supplies. Good luck with your project. thechicsite.com › 2013/11/17 › new-storage-uses-for-old-things

Clever Storage Using Repurposed Items - The Chic Site

Nov 17, 2013 - Clever Storage Uses for Repurposed Items :: A shower caddy doubles as ... I'm amazed by how functional, thrifty and chic this craft is. ... shower curtain, A Thousand Words blog shows us how repurposing a tension rod as a ...

Without a picture, I would say get it out of the wet area as you didn’t say it was stainless steel.

Hi, here's a tutorial to turn the shower caddy into a wall planter - https://www.hometalk.com/26802356/use-a-shower-caddy-as-wall-planter

Hope this helps.

Use a Shower Caddy as Wall Planter