Grainy Glow and OuterGlowBitmapEffect, GlowSize, Noise
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="Microsoft.Samples.Graphics.RectangleExample"
WindowTitle="Example">
<Canvas>
<Button Margin="3,20,3,10">
<Button.Content>Grainy Glow</Button.Content>
<Button.BitmapEffect>
<OuterGlowBitmapEffect GlowColor="LimeGreen" GlowSize="15" Noise="0.5"></OuterGlowBitmapEffect>
</Button.BitmapEffect>
</Button>
</Canvas>
</Page>
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