Use Image as the Grid background
<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid Grid.Row="0" Margin="5">
<Grid.Background>
<ImageBrush ImageSource="c:\image.jpg" />
</Grid.Background>
<Ellipse Width="200" Height="200" StrokeThickness="0"
Fill="Yellow" Margin="20">
<Ellipse.OpacityMask>
<RadialGradientBrush GradientOrigin="0.5,0.5"
Center="0.5,0.5" RadiusX="1" RadiusY="1">
<GradientStop Offset="0" Color="Transparent" />
<GradientStop Offset="1" Color="Yellow" />
</RadialGradientBrush>
</Ellipse.OpacityMask>
</Ellipse>
</Grid>
</Grid>
</UserControl>
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