I think it also depends on where it is. If it's under a bridge in a built-up area hearts painted on a rock can be acceptable, the same thing in the backcountry, not so much.
Back in Sep, our local small brewer asked me to build him some beer cases
We agreed to work for Beer
My canoe partners/sons are getting the hardwood version of the case.
The boxes are all made from Pallet Wood.
I've used them on a campfire, and I've also used them on a Coleman Stove.
Teach a kid to drop pine cones down the chimney of a KK and you'll never have to tend the stove again.