public class MarginConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            var uiElement = value as FrameworkElement;
            var multiply = string.IsNullOrEmpty((string)parameter) ? 1 : System.Convert.ToInt32(parameter);
            if (uiElement == null) throw new NotSupportedException();
            var depth = GetDepth(uiElement);
            return new Thickness(depth * multiply);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        private static int GetDepth(DependencyObject uiElement)
        {
            var element = uiElement;
            int index = 0;
            while ((element = VisualTreeHelper.GetParent(element)) != null)
            {
                index++;
            }
            return index;
        }
    }

    <Window.Resources>
        <local:MarginConverter x:Key="MarginConverter"/>
        <Style TargetType="{x:Type Grid}">
            <Setter Property="Margin" Value="{Binding RelativeSource={RelativeSource Self}, Converter={StaticResource MarginConverter}, ConverterParameter=10}"/>
        </Style>
    </Window.Resources>
    <Grid Background="Green">
        <Grid Background="Red">
            <Grid Background="Blue">
                <Grid Background="Orange">
                    <Grid Background="Yellow">
                        <Grid Background="Silver">

                        </Grid>
                    </Grid>
                </Grid>
            </Grid>
        </Grid>
    </Grid>