In 1996 I was shopping in Excelsior, Minnesota and purchased an item that was placed in a paper bag with this flower art on the it. I thought the artwork was so cool that I cut it off the paper bag and framed it. I don't understand how it was created, but I love the 3D feel/look.
In the picture below I tried to give you a closeup of the copper stuff that defined the flowers and leaves.
Don't you just love it?
The picture hangs in one of my bathrooms that has a mauve tiled floor.