Material Symbol Icon temp setting for Material 3 Expressive, article at

snippet.dart

MaterialSymbolsBase.setOutlinedVariationDefaults(
        color: Colors.red,
        fill: 1,
        weight: 300,
        grade: 0,
        opticalSize: 40.0);
    MaterialSymbolsBase.setRoundedVariationDefaults(
        color: Colors.blue,
        fill: 0,
        weight: 400,
        grade: 200,
        opticalSize: 48.0);
    MaterialSymbolsBase.setSharpVariationDefaults(
        color: Colors.teal,
        fill: 0,
        weight: 600,
        grade: 0.25,
        opticalSize: 20.0);

    // then use VariedIcon.varied() to create your icons - instead of Icon() directly
    Icon example = VariedIcon.varied( Symbols.developer );