This is a complete (I think) dark color palette for the Qt 5 Fusion theme, as well as a nice style sheet for the tool tips that make them blend better with the rest of the theme. To have immediate effect, be sure to put this in your main function before showing the parent window. Child windows should automatically inherit the palette unless you …

Qt 5 Dark Fusion Palette

    qApp->setStyle(QStyleFactory::create("Fusion"));

    QPalette darkPalette;
    darkPalette.setColor(QPalette::Window, QColor(53,53,53));
    darkPalette.setColor(QPalette::WindowText, Qt::white);
    darkPalette.setColor(QPalette::Base, QColor(25,25,25));
    darkPalette.setColor(QPalette::AlternateBase, QColor(53,53,53));
    darkPalette.setColor(QPalette::ToolTipBase, Qt::white);
    darkPalette.setColor(QPalette::ToolTipText, Qt::white);
    darkPalette.setColor(QPalette::Text, Qt::white);
    darkPalette.setColor(QPalette::Button, QColor(53,53,53));
    darkPalette.setColor(QPalette::ButtonText, Qt::white);
    darkPalette.setColor(QPalette::BrightText, Qt::red);
    darkPalette.setColor(QPalette::Link, QColor(42, 130, 218));

    darkPalette.setColor(QPalette::Highlight, QColor(42, 130, 218));
    darkPalette.setColor(QPalette::HighlightedText, Qt::black);
    
    qApp->setPalette(darkPalette);

    qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");

How can one add palette for disabled controls to qtquickcontrols2.conf? Or is this done in some other way?

Nice! I use this for my Qt dark theme example of a text editor.

Hi, ok, quick question... I got the dark theme working and all but I got this annoying white border, like 1-2px wide. Currently I'm looking at Jorgen-VikingGod's example trying to figure out exactly what is the property that disables that border but maybe someone can enlighten me. Thanks !

I had to fix appearance of disabled widgets:

    QColor darkGray(53, 53, 53);
    QColor gray(128, 128, 128);
    QColor black(25, 25, 25);
    QColor blue(42, 130, 218);

    QPalette darkPalette;
    darkPalette.setColor(QPalette::Window, darkGray);
    darkPalette.setColor(QPalette::WindowText, Qt::white);
    darkPalette.setColor(QPalette::Base, black);
    darkPalette.setColor(QPalette::AlternateBase, darkGray);
    darkPalette.setColor(QPalette::ToolTipBase, blue);
    darkPalette.setColor(QPalette::ToolTipText, Qt::white);
    darkPalette.setColor(QPalette::Text, Qt::white);
    darkPalette.setColor(QPalette::Button, darkGray);
    darkPalette.setColor(QPalette::ButtonText, Qt::white);
    darkPalette.setColor(QPalette::Link, blue);
    darkPalette.setColor(QPalette::Highlight, blue);
    darkPalette.setColor(QPalette::HighlightedText, Qt::black);

    darkPalette.setColor(QPalette::Active, QPalette::Button, gray.darker());
    darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
    darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
    darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
    darkPalette.setColor(QPalette::Disabled, QPalette::Light, darkGray);

Thanks @leplatrem, @QuantumCD

I've used the style in my steganography app.
All the best to you guys!

I had to fix appearance of disabled widgets:

    QColor darkGray(53, 53, 53);
    QColor gray(128, 128, 128);
    QColor black(25, 25, 25);
    QColor blue(42, 130, 218);

    QPalette darkPalette;
    darkPalette.setColor(QPalette::Window, darkGray);
    darkPalette.setColor(QPalette::WindowText, Qt::white);
    darkPalette.setColor(QPalette::Base, black);
    darkPalette.setColor(QPalette::AlternateBase, darkGray);
    darkPalette.setColor(QPalette::ToolTipBase, blue);
    darkPalette.setColor(QPalette::ToolTipText, Qt::white);
    darkPalette.setColor(QPalette::Text, Qt::white);
    darkPalette.setColor(QPalette::Button, darkGray);
    darkPalette.setColor(QPalette::ButtonText, Qt::white);
    darkPalette.setColor(QPalette::Link, blue);
    darkPalette.setColor(QPalette::Highlight, blue);
    darkPalette.setColor(QPalette::HighlightedText, Qt::black);

    darkPalette.setColor(QPalette::Active, QPalette::Button, gray.darker());
    darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
    darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
    darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
    darkPalette.setColor(QPalette::Disabled, QPalette::Light, darkGray);

Awesome thank you! For Python, use this:

palette.setColor(QPalette.Disabled, QPalette.Button, QColor(35, 35, 35))

When I had floating docks using this I got white lines on the left edge.
Setting QPallete::Light to the same color as QPalette::Window fixed it.

darkPalette.setColor(QPalette::Light,QColor(53, 53, 53));