Plant succulents in them, use them for storage (paper clips, thumb tacks), candles, etc.
At holiday time make jams/jellies and give them to friends.
There are many ideas that you can make with these little jars.
Use them in your garden or inside your home as light displays or nightlights. I took leftover globes or glasses and put the top of solar lights in them. See photos
How many is 'tons' ?