위에꺼가 WPF 기본 프로그레스 바.
 아래꺼가 튜닝한 프로그레스 바.


 소스

<Window.Resources>
        <LinearGradientBrush x:Key="PressedBrush" StartPoint="0,0" EndPoint="0,1">
            <GradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Color="#BBB" Offset="0.0"/>
                    <GradientStop Color="#EEE" Offset="0.1"/>
                    <GradientStop Color="#EEE" Offset="0.9"/>
                    <GradientStop Color="#FFF" Offset="1.0"/>
                </GradientStopCollection>
            </GradientBrush.GradientStops>
        </LinearGradientBrush>

        <SolidColorBrush x:Key="SolidBorderBrush" Color="#888" />
        <LinearGradientBrush x:Key="DarkBrush" StartPoint="0,0" EndPoint="0,1">
            <GradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Color="White" Offset="0.1"/>
                    <GradientStop Color="Tomato" Offset="1.0"/>
                </GradientStopCollection>
            </GradientBrush.GradientStops>
        </LinearGradientBrush>
        <LinearGradientBrush x:Key="NormalBorderBrush" StartPoint="0,0" EndPoint="0,1">
            <GradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Color="#CCC" Offset="0.0"/>
                    <GradientStop Color="#444" Offset="1.0"/>
                </GradientStopCollection>
            </GradientBrush.GradientStops>
        </LinearGradientBrush>




        <Style x:Key="{x:Type ProgressBar}"
     TargetType="{x:Type ProgressBar}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type ProgressBar}">
                        <Grid MinHeight="14" MinWidth="50">
                            <Border
            Name="PART_Track"
            CornerRadius="2"
            Background="{StaticResource PressedBrush}"
            BorderBrush="{StaticResource SolidBorderBrush}"
            BorderThickness="1" />
                            <Border
            Name="PART_Indicator"
            CornerRadius="2"
            Background="{StaticResource DarkBrush}"
            BorderBrush="{StaticResource NormalBorderBrush}"
            BorderThickness="1"
            HorizontalAlignment="Left" />
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>
   
    <ProgressBar Value="70" Height="20"></ProgressBar>


참~ 쉽죠잉. 


P.S : MSDN에도 동일한 예제가 있다는 사실.
P.S2 : Eagle is Mangle.