<toolkit:WrapPanel x:Name="wp">
    <Border BorderBrush="Black" BorderThickness="5" >
        <Image Source="myimage.png" />
    </Border>
</toolkit:WrapPanel>

或者在代码中将其添加到WrapPanel：

var b = new Border
            {
                BorderBrush = new SolidColorBrush(Colors.Black),BorderThickness = new Thickness(5)
            };

var bi = new BitmapImage
                {
                    UriSource = new Uri("/myimage.png",UriKind.Relative)
                };

b.Child = new Image {Source = bi};

wp.Children.Add(b);