read https://develop.kde.org/docs/plasma/theme/quickstart/
You can use existing themes for reference, just download the source and look at it. https://github.com/topics/kde-plasma-theme
this post was submitted on 25 Feb 2026
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Yep, start from there, I would also like to point out that in the newly released Plasma 6.6 you can save your current settings as a global theme, so you also have that starting point.
The easiest way to create a theme for KDE is probably with Kvantum:
https://github.com/tsujan/Kvantum/blob/master/Kvantum/doc/Theme-Making.pdf
Look at other themes, how they were done.