defaultValue  =QColor(0, 0, 255)
value = QColor(100,100,100)
QSettings(pluginName, pluginName).setValue(name, [value.red(),value.green(),value.red()])
QSettings(pluginName, pluginName).value(name, defaultValue, type=list)
Traceback (most recent call last):
  File "<input>", line 1, in <module>
TypeError: unable to convert a QVariant of type 11 to a QMetaType of type 300