There are some bad task related to icon creation. Most important think is you must create icon for each app/mime-type or it was loaded from other theme, so do not match other icons.
I do not known how powered are local AI (NPU chips), but MS told Paint could paint images by given word description,
Maybe do the same think? Author of theme could give description, for example: “Background should be circle red and each other circle should not been ideal. Each person should looks like in cartoon”.
And app icon could been description, such like: “It is guy carrying blue trousers and yellow t-shirt.”.
My question is: the icon of the app could been generated, using these two description? How hard it would be (to create system like that. Keep in mind, these system would only work, when user are installing new icon to the system or new icon theme.
It could been great if this system will work locally, but there could be cloud or local tool for icon theme designers, where author describes theme click generate button and tool will download description of each icon from store.kde.org and will generate icon theme.