ImageBrush's tiles are set to 50% by 50% of the output area
<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">
<Rectangle
Grid.Row="6" Grid.Column="0"
Width="200" Height="150"
Stroke="LimeGreen" StrokeThickness="1" HorizontalAlignment="Left">
<Rectangle.Fill>
<ImageBrush
Viewport="0,0,0.5,0.5"
TileMode="Tile"
AlignmentX="Left"
AlignmentY="Top"
ImageSource="c:\image.jpg" />
</Rectangle.Fill>
</Rectangle>
</Grid>
</Page>
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