.... what would it look like .....
I guess contemporary marble makers do it all the time, so maybe some of you have already designed and made your own marbles.
I'll probably never make a marble with a torch, but from time to time I think about learning to use photoshop ... or trying to draw ... to make my ideal marble. But I can't even decide if it must have aventurine much less what the design would be, so I'm not ready to go to production.