Do you like to eat blue/bleu cheese? Blue cheese dressing? “Blue cheese is made using Penicillium, a type of mold that’s responsible for its unique taste, smell, and appearance. Unlike other types of mold, Penicillium does not produce toxins and is safe to consume.”

That’s a slab of marble metamorphic rock!
But it made me think of blue cheese.
Blue cheese how it’s made video
Jellycat makes an amuseable plush toy that’s a soft slab of blue cheese. With legs! You can see it here
Marble seems to have similar veins