http://blogs.wankuma.com/iijimas/archive/2007/07/18/85815.aspx
つい書いちゃうわけだけど
http://naka.wankuma.com/site/special/2007/07/mugendai.xaml
ベースはExpression Designで書いて、Xamlで調整
<?xml version="1.0" encoding="utf-8"?>
<Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:c="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2006" c:Ignorable="d" x:Name="名称未設定1" Width="793.92" Height="1122.24">
<Canvas x:Name="Layer_1" d:IsLayer="True" Width="600" Height="600" Canvas.Left="0" Canvas.Top="0">
<Path x:Name="Path" Width="277.483" Height="245.483" Canvas.Top="10" Canvas.Left="10" Stretch="Fill" StrokeThickness="1" StrokeLineJoin="Round" Stroke="#FF000000" Data="F1 M
200,300L
250,300L
200,300L
100,300L
100,150L
250,150L
250,250L
200,250L
250,250L
350,250L
350,400L
200,400L
200,300
Z M
200,250L
200,200L
150,200L
150,250L
200,250
M
250,300L
250,350L
300,350L
300,300L
250,300">
<Path.Fill>
<LinearGradientBrush StartPoint="0.825946,0.0442086" EndPoint="1.79464,0.0442086">
<LinearGradientBrush.RelativeTransform>
<TransformGroup>
<SkewTransform CenterX="0.825946" CenterY="0.0442086" AngleX="-6.96165" AngleY="0"/>
<RotateTransform CenterX="0.825946" CenterY="0.0442086" Angle="128.41"/>
</TransformGroup>
</LinearGradientBrush.RelativeTransform>
<LinearGradientBrush.GradientStops>
<GradientStop Color="#FFFF0000" Offset="0"/>
<GradientStop Color="#FFFFFC2B" Offset="1"/>
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Path.Fill>
</Path>
</Canvas>
</Canvas>