I've carved mine out of green wood. They have so much surface area that they've dried nicely with no cracking. And it's so easy to shape. I get fat sticks with a long enough section free of knots, peel them and split into quarters, then shape them with a knife. I've done black walnut, wild persimmon, and I forget what all else. Works fine. And if it doesn't for some reason, I've lost no money and maybe 15 minutes of time. I'd try pretty much any wood. Definitely apple and mulberry.
I've no experience with the other materials. Rock would be a pain to shape, and I'd be worried about the weight and whether it would break if you dropped it. Could be stunning though. I'd suggest using it as a topper.
I'd think woody roots would work the same as other wood. Worth a try anyway.
How difficult and expensive would it be to get some reishi? It'd be a fun experiment it was cheap and easy. Worst case is it doesn't work.
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