Wings.

 

I managed to scan a rather old and brittle cicada wing with the idea of using it to make prints from. 

By the time I had deleted ragged bits and cleaned it up it looked O.K. but lacking in texture.

 Here I've rolled over it on a gelatine plate with a brayer, giving more texture, but not quite what I was looking for.

By the time I had rolled over the wing a few times it had broken up and I didn't like the brayer marks which appeared because I had to press down a bit to get the wing impression.
Maybe another technique will give a better result.

          The Photoshop Invert command produces images that remind me very much of fossils.