<Grid>
    <Grid.Background>
        <VisualBrush Stretch="None">
            <VisualBrush.Visual>
                <Grid Width="{Binding ActualWidth,
                        RelativeSource={RelativeSource FindAncestor, AncestorType=Panel}}"
                      Height="{Binding ActualHeight,
                        RelativeSource={RelativeSource FindAncestor, AncestorType=Panel}}">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="30"/>
                        <ColumnDefinition Width="*"/>
                        <ColumnDefinition Width="30"/>
                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="50"/>
                        <RowDefinition Height="*"/>
                        <RowDefinition Height="50"/>
                    </Grid.RowDefinitions>
                    <Grid.Resources>
                        <Style TargetType="Image">
                            <Setter Property="Stretch" Value="Fill"/>
                            <Setter Property="RenderOptions.EdgeMode" Value="Aliased"/>
                        </Style>
                    </Grid.Resources>
                    <Image Source="D:red8x8.png"   Grid.Row="0" Grid.Column="0" />
                    <Image Source="D:black8x8.png" Grid.Row="0" Grid.Column="1" />
                    <Image Source="D:red8x8.png"   Grid.Row="0" Grid.Column="2" />
                    <Image Source="D:black8x8.png" Grid.Row="1" Grid.Column="0" />
                    <Image Source="D:red8x8.png"   Grid.Row="1" Grid.Column="1" />
                    <Image Source="D:black8x8.png" Grid.Row="1" Grid.Column="2" />
                    <Image Source="D:red8x8.png"   Grid.Row="2" Grid.Column="0" />
                    <Image Source="D:black8x8.png" Grid.Row="2" Grid.Column="1" />
                    <Image Source="D:red8x8.png"   Grid.Row="2" Grid.Column="2" />
                </Grid>
            </VisualBrush.Visual>
        </VisualBrush>
    </Grid.Background>
</Grid>