I unintentionally made a little bit of a crown path on my
yard. It's a bit of
wood shavings and quail
poop from Henry's quail, and a bit of wood chip mulch had been in that strip too.
It worked.
To some degree, the snow melted off of both sides of that thing, leaving me a path I can walk on that's not turning into ice (the rest of things around there are getting icy, probably because i'm trying to capture water in the landscape and it doesn't soak in before it freezes).
This sort of answers my question. I think this could be useful for making footpaths that are a bit more navigable than the surrrounding terrain.
To be clear, I wasn't trying to make a crown, and I wouldn't say I actually made one, it just happened to have the shape of the crown and a bit of the effect, just a slight mounding of mulch and shavings and poop. Mounded the way a strip of mulch will naturally fall. (I had put it there mostly to capture a bit of water on contour).
The poop may be warming that a bit, I don't know; I can't imagine it's breaking down much at all at near-zero temps, but maybe it does a little bit each time the temperature goes up. At any rate it gives it an edge over the surrounding snow.