Oak Leaves on Metal

I was up in the mountains over the weekend and collected various organics from the forest floor to use in my metals class.  After annealing, I sandwiched some very dry oak leaves and pine needles between silver and some copper.  I cranked this through a rolling mill and you can see the beautiful detail of nature forever impressed upon my metal.  I lightly sanded the metal with a fine, higher grit sandpaper before milling.  The leaves over the sanded metal in a way, protected that finish and the other areas that received more pressure, seemed to shine up.  You can adjust the mill however you want, but I like how these pieces came out.  I will be working on some pendants and will patina them again when I'm finished.