No, you can be the first to make them. Perhaps we could have make a small design contest, just for fun.
Again, no official coin design, we can have as many as we like and perhaps give a small price in Grin to the winner. If you like the idea of a physical Grin coin design contest, upvote this post 
There were some RFID 3D printed plastic coins, I think they were on slate-market. Do you remember who made them @dog?
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I’ll be one of the ones who will buy them.
I will check around to see if someone could make them.