Aluminium is an excellent material for printing photos onto, and when I saw this it was the first thing I thought of. Too bad you don't offer that material yet because you could make some really cool art to hang on your wall which would look fantastic and last for a very long time. Here is one example of a supplier with a very limited selection of shapes: http://aluminyze.com/ Now imagine having them print a big skyline photo of a city and shipping it to you to have the sky cut out. It would look pretty amazing, and generating the vector path wouldn't bee too difficult if the image had suitable contrast (or the object in silhouette).
