The default, transformed by prepare_value() and the theme overrides.

def themed_default(self, cls, name, theme_overrides):
        ''' The default, transformed by prepare_value() and the theme overrides.

        '''
        overrides = theme_overrides
        if overrides is None or name not in overrides:
            overrides = cls._overridden_defaults()

        if name in overrides:
            default = self._copy_default(overrides[name])
        else:
            default = self._raw_default()
        return self.prepare_value(cls, name, default)