I've been wondering if I can turn them back into logs. I've got some
old oil finishes to use as binder, some 4" stovepipe to use as a mold,
and a roll of 4' wide paper to use as a wrapper. Wonder if anyone has
tried this before.

Otherwise, mine get dumped off the edge of the lawn, where the rocks
were piled after the house was built. They fill in the gaps and help
cover the rocky edges and such. Grass clippings go there too.