KDE Global

Systemwide themes and icons are placed in:

/usr/share/plasma/desktoptheme/
/usr/share/icons/

User spesific themes and icons are placed in:

~/.local/share/plasma/desktoptheme/
~/.local/share/icons/

Krita icons and themes

Icons and themes are storde in:

~/.local/share/krita/color-schemes
~/.local/share/krita/preset_icons