I have started thinking about including a "float mount" portrait in my product offering ever since I saw whcc's recently released "float wrap". I was planning on just going with that product until I decided I should see what else there is out there. I don't have anything particular in mind. I just don't like the stand out mounting that whcc has... it is too modern.
An example to jog your thinking cap:
I recently ran across the ChromaLuxe Silver Photo Panels (highlighted in this month's Rangefinder Hot Pix section) which is an image on a metal backing I believe float mounted (though checking into that).
www.chromaluxe.com