Those look great!

I generally do my own designing and when I need something like that I draw it up and have the patterns made with a water jet (from aluminum). I have made a backgammon board with an inlay set but mostly I use them to make “Flying Dutchmen/Bow ties”….although I have sometimes joined countertops with a similar shape as your Yin/Yang symbol.

What are your patterns made from? Where are you located?
Might be worth looking into retail stores like Lee Valley, Windsor Plywood etc.. (Canada)
They sell a lot to the hobby and weekend wood workers.

Angellos