General Request for Information

When Dorris and I visited her relatives in Arkansas, in one of the guest rooms we stayed in for decoration they had had jars with shells and stones and flowers in them, suspended in liquid. Some of the jars had clear liquid, some had pale colored liquid (blue, green, pink). I don't remember if the flowers and other plant life were real or plastic, as I just noticed them in passing.
Can anybody tell me what the hell those things are, and where, on the great world wide wasteoftime I might find out more about them?