I have done three Couse skulls in copper and two in bronze, both with patina applied. Using quality products (Actual metal coatings) from Sculpt Nuevou. A unique way to time capsule a memory.
Interested in doing this for others as a little hobby. If you have a clean euro that you would like to have done, I would be happy to do one at cost of the materials in turn for your review here. No idea what to charge for the service thereafter and open to suggestions. This is a multi-day process is to clean, prime and the apply three coats of metal. Finish with patina for an aged look (If desired), buff and apply a matte clear coat. About a week to allow proper drying cycles between steps.
I can do the euro too, but prefer to work with a clean dry skull and just focus on the metal application.
Attached are some pics for reference, with and without patina applied.