Creating New Stationary

Does anyone know if it is possible to create a stationary where you can take an image and embed it as a background to an email (like a watermark)? I know how to import an image into stationary, but when I apply the stationary to a new email, but all the text wraps around the image. I am going to modify the transparency of the image and want the image to be a background and all text to type over the top of it. Is this possible and if so, how do I do this?

Thanks,

Brian