Set Border's BorderBrush to ImageBrush
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="Microsoft.Samples.Graphics.UsingImageBrush.TilingExample" >
<Grid Margin="20">
<Border Grid.Row="6" Grid.Column="4" BorderThickness="20" Width="200"
HorizontalAlignment="Left">
<Border.BorderBrush>
<ImageBrush ImageSource="c:\image.jpg" Viewport="-0.1,-0.1,1.5,1.5" />
</Border.BorderBrush>
<DockPanel>
<TextBlock DockPanel.Dock="Top" TextWrapping="Wrap" Margin="10">This DockPanel has a border painted with an ImageBrush.</TextBlock>
</DockPanel>
</Border>
</Grid>
</Page>
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