Software:
7zip (https://www.7-zip.org/)

Websites:
https://game-icons.net/

Open this folder in Windows Explorer:
...\SteamLibrary\steamapps\common\Card Creator\IconGallery

...Or just right click "Card Creator" in your library > "Manage" > "Browse local files"

What can't this site do! So handy!

Download with those selections. You can choose to download them in black, but know you cannot change the color of the icons if they are initially set to black.


Sure, you can download the WHOLE THING.
Why is that bad?
This is why:

The folder structure is based on the structure of:
color\ background color\ image array\ artist's name
...then each of their images.

If you grab the big file, it is impossible to sort otherwise.


This not only makes it easier to grab the PNG files, but you have them separated into folders to make it easier to find them when looking for icons, as well.

• Make a folder called "Old Icons" and copy the folders from "IconGallery" into it.
  
• Make sure the Card Creator app is closed.

You can create new folders and add icons into each other folders. Here's a folder I made called "MDG" that contains various astronomy icons in it.

And when i open the app, i can see my folder and icons within!

Let's say you want to start changing the icons and swap out the old ones. Simple as highlighting the old icons in each of the "IconGallery" folders and dropping in the PNGs from the zipped tag icon ones.

grab a thumbdrive and copy your updated "IconGallery" and replace it. Always backup, just in case!

https://thenounproject.com/pricing/#icons

https://www.flaticon.com/pricing

https://icons8.com/pricing