I have bbottleseen seeing tiny bottles showing up everywhere lately. They have been used to hold many different types of items, including polymer clay mini food cane slices to lady bugs,  fish, sea turtles, mermaids and many other summer themed items. Here is a collection of some of the designs I found online. Most of them come with a tiny cork stopped, which jewelry makers are adding eye pins to to create charms for necklaces or earrings. Many have tiny polymer clay sculptures suspended in clear or tinted resin. I did find some bottles that were filled with just clay pieces or clay objects were glued to the outside of the bottles to look like they were hanging on to the bottle itself.