https://www.gnome-look.org/browse?cat=132&ord=latest
many probably know of this site, I just found it. 1700 gratis icon sets. Of 51 icons sets a page I find about two or very lovely and cool per page. Creative people out there.
Of the 15 I clicked on, most creators say right up front they created the set with KDE in mind, despite the name of the website.
Personally I was attracted to the WIN11 knockoff icons as I've never seen W11 icons before.
PS--I haven't cracked open a targz yet, and as a security-minded person, I have to assess this all or rationalize it. I saw some people comparing themes and they referred to this website.
All it takes is one bad actor and you extracting a targz then silently a script executes....I've come too far and modified many habits to just blindly install.........if anybody can vouch for the site I'd consider installing a theme.