<Rectangle Width="60" Height="60" Fill="Blue">
<Rectangle.RenderTransform>
<MatrixTransform>
<MatrixTransform.Matrix >
<!-- This matrix transforms the x,y position of
the rectangle and skews it. -->
<Matrix OffsetX="30" OffsetY="100" M12="0.5" />
</MatrixTransform.Matrix>
</MatrixTransform>
</Rectangle.RenderTransform>
</Rectangle>