The ivy is made from fabric, I also tried to use real leaves but then you have to cover them with acrylic or something...
unfortunatetly I converted the Project into a how-to and do not know how to undo :-(
so.. ok, there's a how-to... but without pictures (because I have none) and in not-really-well enlish (because it's from me *g*)
Take your leaf and put it on some paper. Draw a line around. This is the raw-model of your brooch.
Now you can modify the outer form, add the stalk or some ornament, just how it's up to you ;-)
Decide the width of the "frame", the leaf should be covered, the rest is your choice, draw the frameline on the paper, too...
transfer both, groundplate and frame on 0,5mm steelplate and saw out.
polish the surface of the frame very bright and the back of the groundplate so there are no more scratches visible
Make the surface of the groundplate raw and cover lightly with epoxy, put on the leaf.
If you want to glue on the frame, do the same (surface raw, epoxy - and together)
But you also can rivet both together (may last longer, but epoxy also works well)
If you've used a real dried leaf, fill the frame with a thin layer of epoxy or acrylic so the leaf is keeped and covered ;-)
Now glue on the stitch (?!) [I don't know the english word, sorry!] at the back and let dry.
You also can drill a hole in the stalk an make it a chain pendant, there are many ways to use the Ivy :-)