That's a picture from Julia @ Salukifeathers that I've seen posted in a few places. She does some amazing things.. My wife got a collar with roses from her for our female, and we adore it. I've been thinking about asking for a Star Wars theme collar from her for our male.. I'm sure she can do something Arthurian. I'm not certain of the rules for posting contact info - so you can search Salukifeathers and she'll come up.
The roses collar is what inspired me to start leatherworking.. It'll be a few years before I come close to being able to think about doing something that nice..