There are several people that create these. I am one of them, I know Baluk does a lot of them, and at least a couple of others. Speaking for myself, I will often take requests, so if you have some particular style of board you are interested in let me know. Or if you've seen pieces around, if I can find a high enough quality version, I can convert them for you. I have a website where I do this kind of thing:
http://gorgonian.weebly.com/lichessorg.html
http://gorgonian.weebly.com/lichessorg.html