I've added slots to each of the showers that had enough space for objects to be placed on them. I've not added any swatches, they are all the original EA colours.

The majority of the showers have just a line or 2 of slots added on the floor.
A few of them have a shelf that I had enough space for a slot.

I haven't changed the location in the build/buy menu, or the price of any of the showers. They are all found in plumbing > showers

May conflict with other mods that edit the showers listed below

This is an OVERRIDE it will REPLACE all the showers I've added slots to

You can download the all in one file if you own all the packs.
You can "mix and match" the downloads by downloading the base game showers + whatever packs you have installed separately (each are labelled for which pack you need)
The base game showers are seperated if you don't own any packs at all



Edited showers & number of slots:
Base Game
Crystal Box Shower Stall (5 small), Post Modern Shower Stall (5 small), RAW Walk-In Shower (9 small), The Peregrine (7 small), Unicorn Dreamshower (5 small)
City Living
Plink Shower (9 small)
Get Famous
The Swan's Ablution (5 small), Designer's Deluge (5 small)
Get To Work
Hygienic Decontamination Pod (13 small)
Island Living
In Or Out? - Outdoor Shower (9 small)
Seasons
Vintage Subway Tile Shower (13 small)
Jungle Adventure
Stereogram Tile Shower (9 small)
Realm of Magic
Loudini?s Chamber of Sprinkles (10 small)
Fitness Stuff
At One With Shower (13 small)