using Microsoft.Xna.Framework.Media;

// Later in code.
using (MediaLibrary ml = new MediaLibrary())
{
    List<Image> ListImages = new List<Image>();
    foreach (var item in ml.Pictures)
    {
        using (Stream stream = item.GetImage())
        {
            ListImages.Add(new Image { Source = PictureDecoder.DecodeJpeg(stream) });
        }
    }
}
ListBoxImages.ItemsSource = ListImages;

<ListBox x:Name="ListBoxImages" ItemsSource="{Binding ListImages}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <Image Source="{Binding BindsDirectlyToSource=True}" />
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>