Mini composter #geocache. I've seen containers like this in Dollarama; they're pencil holders. (pinned from websta to Creative Micro Geocaches - pinterest.com/islandbuttons/cool-creative-micro-geocaches/)
This would be a neat idea for a micro. Instead of a log in a baggie in the walnut, the logbook is the walnut. You'd probably have to use Rite in the Rain waterproof paper though since with no cover, (Diy Ornaments Box)
It is a good idea! Thieves, pls don't search my yard for pinecones! Here's a good idea to hide your extra house key - put it in a medicine bottle, glue a pinecone or rock on top, stick the bottle in the yard or planter.