New Post: How to combine multiple images into one

using (MagickImageCollection images = new MagickImageCollection("snow.gif"))
{
  using (MagickImage background = new MagickImage("background.jpg"))
  {
    // You only need this when your background image is not the same size.
    background.Resize(images[0].Width, images[0].Height); 

    foreach (MagickImage image in images)
    {
      image.Composite(background, Gravity.Center, CompositeOperator.DstOver);
    }
  }

  images.Optimize();
  images.Write("snow-background.gif");
}