What should I put in this teeny tiny bottle?

I got a really small glass bottle from the craft store, the cork has a little ring on it so you can use it on a charm and put it on a necklace or something, which I'm going to do, but I want to put something in the bottle. It had to be something really small. I've seen ones online that have paper with... show more I got a really small glass bottle from the craft store, the cork has a little ring on it so you can use it on a charm and put it on a necklace or something, which I'm going to do, but I want to put something in the bottle. It had to be something really small. I've seen ones online that have paper with writing, like a message in a bottle, but I don't really want to do that, I've also seen the tiny terrarium ones, which I love, but I think mine's too tiny also. Any ideas? The bottle's like, smaller than an inch big.
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