My friend and I use them as ash trays for joints, but it's likely you already have an ash tray. My best idea would be to wash it out and use it as a container for any very small items you may have.
I use the glass ones to hold small amounts of different oils I'm trying out for clock repair. Also for soaking small parts in solvents or denatured alcohol.
Jars are great for starting any plant to get roots going. Put them in just enough water to cover the cut end. I've propagated plants I've found in parking lots or cuttings this way. Just plain water.
When you see about a quarter inch of roots, plant it.
Buy high quality syrup and put a visible spice element in there - like a cinnamon sprig - then sell (or trade) it at the farmer’s market as CBD infused and _____ spiced syrup
Just spitballing here and yes, this might be considered illegal and unethical
Fill them with the tears of your enemies, then sell it back to said enemies as anal lube. The slogan can be "memories from Sunday school". You are welcome, follow me for more great home crafting ideas...
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When you see about a quarter inch of roots, plant it.
Just spitballing here and yes, this might be considered illegal and unethical