I'm not sure what you mean by ornate? Color CAN be affected by environments. Tortoises kept cooler will increase their melanin production to darken their shells and therefore retain more heat. But most color is genetic.
Wow. What a handsome and venerable tortoise Henri is. What a history he must have. Did you know the original owner? I think it would be so cool to have Taco till I am old and tottering. Then I will entrust her to one of my grandkids--one of Marci's kids since she was the original owner, haha!