Path with OuterGlowBitmapEffect
<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="WPF" Height="230" Width="500">
<Canvas Margin="10">
<Canvas.Resources>
<GeometryGroup x:Key="Clown" FillRule="Nonzero">
<RectangleGeometry Rect="30,120 20,10"/>
</GeometryGroup>
</Canvas.Resources>
<Path Canvas.Left="170" Canvas.Top="10" Data="{StaticResource Clown}"
Stroke="Black" StrokeThickness="4" Fill="Wheat">
<Path.BitmapEffect>
<OuterGlowBitmapEffect GlowColor="Green" GlowSize="30" />
</Path.BitmapEffect>
</Path>
</Canvas>
</Window>
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