We made "Flavored Salt" when we studied salt and light.
We put coarse salt in a blender with some fresh rosemary (because I had a bunch of it). (You can find 'recipes' on the web, but seriously, salt and fresh herbs is all you need.)
The kids 'pulsed' it for a while (until the rosemary was in tiny pieces) then poured it into condiment containers (we got them at the dollar store) with lids.
We added labels with the verse "[We] are the salt of the earth..." and a label of what it was.
The kids took one home and had one to give away. Most of them were given out to others at church, but even then, the older folks (who were also studying the sermon on the mount) asked about them and the children were able to encourage them and share their faith.
Plus, every time we use the salt (really great on chicken and veggies!), we remember that we are to be salt to the world.
Staci