Index: qt5ct/CMakeLists.txt
===================================================================
--- qt5ct/CMakeLists.txt	(revision 678)
+++ qt5ct/CMakeLists.txt	(working copy)
@@ -25,8 +25,11 @@
 
 ADD_DEFINITIONS(-DQT_DISABLE_DEPRECATED_BEFORE=0x050C00 -DUSE_WIDGETS)
 
-find_package(Qt5 ${QT_MINIMUM_VERSION} COMPONENTS Widgets Concurrent LinguistTools DBus ThemeSupport REQUIRED)
+find_package(Qt5 ${QT_MINIMUM_VERSION} COMPONENTS Widgets Concurrent LinguistTools DBus QuickControls2 ThemeSupport REQUIRED)
 find_package(Qt5Gui ${QT_MINIMUM_VERSION} CONFIG REQUIRED Private)
+find_package(KF5Config REQUIRED)
+find_package(KF5ConfigWidgets REQUIRED)
+find_package(KF5IconThemes REQUIRED)
 
 get_target_property(QT_LRELEASE_EXECUTABLE Qt5::lrelease IMPORTED_LOCATION)
 
@@ -45,7 +48,9 @@
     message(FATAL_ERROR "Could NOT find qtpaths executable")
 endif()
 
-execute_process(COMMAND ${QT_QTPATHS_EXECUTABLE} --plugin-dir OUTPUT_VARIABLE PLUGINDIR OUTPUT_STRIP_TRAILING_WHITESPACE)
+if(NOT PLUGINDIR)
+    execute_process(COMMAND ${QT_QTPATHS_EXECUTABLE} --plugin-dir OUTPUT_VARIABLE PLUGINDIR OUTPUT_STRIP_TRAILING_WHITESPACE)
+endif()
 message(STATUS "Plugin path: " ${PLUGINDIR})
 
 message(STATUS "Generating translations ...")
Index: qt5ct/src/qt5ct/appearancepage.cpp
===================================================================
--- qt5ct/src/qt5ct/appearancepage.cpp	(revision 678)
+++ qt5ct/src/qt5ct/appearancepage.cpp	(working copy)
@@ -378,7 +378,7 @@
 {
     QDir dir(path);
     dir.setFilter(QDir::Files);
-    dir.setNameFilters(QStringList() << "*.conf");
+    dir.setNameFilters(QStringList() << "*.conf" << "*.colors");
 
     for(const QFileInfo &info : dir.entryInfoList())
     {
Index: qt5ct/src/qt5ct-common/qt5ct.cpp
===================================================================
--- qt5ct/src/qt5ct-common/qt5ct.cpp	(revision 678)
+++ qt5ct/src/qt5ct-common/qt5ct.cpp	(working copy)
@@ -112,6 +112,7 @@
     for(const QString &p : QStandardPaths::standardLocations(QStandardPaths::GenericDataLocation))
     {
         paths << (p + QLatin1String("/qt5ct/colors"));
+        paths << (p + QLatin1String("/color-schemes"));
     }
     paths << QLatin1String(QT5CT_DATADIR"/qt5ct/colors");
     paths.removeDuplicates();
Index: qt5ct/src/qt5ct-qtplugin/CMakeLists.txt
===================================================================
--- qt5ct/src/qt5ct-qtplugin/CMakeLists.txt	(revision 678)
+++ qt5ct/src/qt5ct-qtplugin/CMakeLists.txt	(working copy)
@@ -9,5 +9,5 @@
 
 add_library(qt5ct-qtplugin MODULE ${app_SRCS})
 set_target_properties(qt5ct-qtplugin PROPERTIES OUTPUT_NAME qt5ct)
-target_link_libraries(qt5ct-qtplugin PRIVATE Qt5::Widgets Qt5::GuiPrivate Qt5::DBus Qt5::ThemeSupportPrivate qt5ct-common)
+target_link_libraries(qt5ct-qtplugin PRIVATE Qt5::Widgets Qt5::GuiPrivate Qt5::DBus Qt5::QuickControls2 Qt5::ThemeSupportPrivate KF5::ConfigCore KF5::ConfigWidgets KF5::IconThemes qt5ct-common)
 install(TARGETS qt5ct-qtplugin DESTINATION ${PLUGINDIR}/platformthemes)
Index: qt5ct/src/qt5ct-qtplugin/qt5ctplatformtheme.cpp
===================================================================
--- qt5ct/src/qt5ct-qtplugin/qt5ctplatformtheme.cpp	(revision 678)
+++ qt5ct/src/qt5ct-qtplugin/qt5ctplatformtheme.cpp	(working copy)
@@ -45,6 +45,7 @@
 #endif
 #include <QFile>
 #include <QFileSystemWatcher>
+#include <QQuickStyle>
 
 #include "qt5ct.h"
 #include "qt5ctplatformtheme.h"
@@ -58,6 +59,11 @@
 #include <QStringList>
 #include <qpa/qplatformthemefactory_p.h>
 
+#include <ksharedconfig.h>
+#include <kcolorscheme.h>
+#include <kiconengine.h>
+#include <kiconloader.h>
+
 Q_LOGGING_CATEGORY(lqt5ct, "qt5ct", QtWarningMsg)
 
 //QT_QPA_PLATFORMTHEME=qt5ct
@@ -73,6 +79,10 @@
         QMetaObject::invokeMethod(this, "createFSWatcher", Qt::QueuedConnection);
 #endif
         QGuiApplication::setFont(m_generalFont);
+        //if the user has explicitly set something else, don't interfere
+        if (QQuickStyle::name().isEmpty()) {
+            QQuickStyle::setStyle(QLatin1String("org.kde.desktop"));
+        }
     }
     qCDebug(lqt5ct) << "using qt5ct plugin";
 #ifdef QT_WIDGETS_LIB
@@ -79,6 +89,7 @@
     if(!QStyleFactory::keys().contains("qt5ct-style"))
         qCCritical(lqt5ct) << "unable to find qt5ct proxy style";
 #endif
+	QCoreApplication::instance()->installEventFilter(this);
 }
 
 Qt5CTPlatformTheme::~Qt5CTPlatformTheme()
@@ -185,6 +196,11 @@
 }
 #endif
 
+QIconEngine *Qt5CTPlatformTheme::createIconEngine(const QString &iconName) const
+{
+    return new KIconEngine(iconName, KIconLoader::global());
+}
+
 void Qt5CTPlatformTheme::applySettings()
 {
     if(!QGuiApplication::desktopSettingsAware() || m_isIgnored)
@@ -299,7 +315,15 @@
     if(!schemePath.isEmpty() && settings.value("custom_palette", false).toBool())
     {
         schemePath = Qt5CT::resolvePath(schemePath); //replace environment variables
-        m_palette = new QPalette(loadColorScheme(schemePath));
+        if(schemePath.endsWith(".colors"))
+        {
+            m_palette = new QPalette(KColorScheme::createApplicationPalette(KSharedConfig::openConfig(schemePath)));
+            qApp->setProperty("KDE_COLOR_SCHEME_PATH", schemePath);
+        }
+        else
+        {
+            m_palette = new QPalette(loadColorScheme(schemePath));
+        }
     }
     m_iconTheme = settings.value("icon_theme").toString();
     //load dialogs
@@ -464,3 +488,30 @@
 
     return customPalette;
 }
+
+bool Qt5CTPlatformTheme::eventFilter(QObject *obj, QEvent *e)
+{
+    if(obj == qApp && e->type() == QEvent::DynamicPropertyChange)
+    {
+        QDynamicPropertyChangeEvent *ee = static_cast<QDynamicPropertyChangeEvent*>(e);
+        if(ee->propertyName() == "KDE_COLOR_SCHEME_PATH")
+        {
+            if(qApp->property("KDE_COLOR_SCHEME_PATH").isNull())
+            {
+                QSettings settings(Qt5CT::configFile(), QSettings::IniFormat);
+                settings.beginGroup("Appearance");
+                QString schemePath = settings.value("color_scheme_path").toString();
+                if(!schemePath.isEmpty() && settings.value("custom_palette", false).toBool())
+                {
+                    schemePath = Qt5CT::resolvePath(schemePath); //replace environment variables
+                    if(schemePath.endsWith(".colors"))
+                    {
+                        qApp->setProperty("KDE_COLOR_SCHEME_PATH", schemePath);
+                        applySettings();
+                    }
+                }
+            }
+        }
+    }
+    return QObject::eventFilter(obj, e);
+}
Index: qt5ct/src/qt5ct-qtplugin/qt5ctplatformtheme.h
===================================================================
--- qt5ct/src/qt5ct-qtplugin/qt5ctplatformtheme.h	(revision 678)
+++ qt5ct/src/qt5ct-qtplugin/qt5ctplatformtheme.h	(working copy)
@@ -87,10 +87,13 @@
     //virtual QPixmap fileIconPixmap(const QFileInfo &fileInfo, const QSizeF &size,
     //                               QPlatformTheme::IconOptions iconOptions = 0) const;
 
-    //virtual QIconEngine *createIconEngine(const QString &iconName) const;
+    virtual QIconEngine *createIconEngine(const QString &iconName) const;
     //virtual QList<QKeySequence> keyBindings(QKeySequence::StandardKey key) const;
     //virtual QString standardButtonText(int button) const;
 
+protected:
+	bool eventFilter(QObject *obj, QEvent *e) override;
+
 private slots:
     void applySettings();
 #ifdef QT_WIDGETS_LIB