Any (active) volcano will be good. Just as close to Earth "blood" and soul can get
True story here:
A few years ago when my housekeeping helper and I were going through some stuff in a reorganization effort, she came across a small plastic bag of grey ash. She was promptly horrified and asked if she was holding my grandmother's ashes (I'd told her I still had them; I never buried or scattered them as I had no idea where she might have wanted that done).
She was relieved when I told her no, she was holding some ash from Mt. St. Helens. My mother's in-laws from her second marriage happened to be on a trip down there around the time of the eruption, and they scooped up some ash for a souvenir. Fast-forward a few years to when I went to their place with my mother and step-father for Christmas, and they gave me a small portion of it. It's been part of my rock collection ever since.
And by a coincidence, I just ran across it again a few hours ago (I moved in the meantime and am still finding stuff).
To be quite honest, that's as close as I'd ever want to be to a real eruption. It's partly that I respect the fact that this planet has
no respect for the lifeforms that live here; whatever it does geologically is what it's going to do, irrespective of our wishes, and I don't want to take risky chances.
The other part is that I have the sort of imagination where I can scare myself just by thinking about it. I went to the theatre with my mother many years ago, and we saw
Island at the Top of the World. It included a sequence with a live volcano spewing lava; the scenes with the characters trying to get away from the volcano without falling into the lava nearly had me hiding behind the seat.