This year one of the things we made were Memory Bottles. I discovered a book by that title and fell in love. The story is about a boy who's elderly neighbor has a mysterious shed. I love the illustrations of all the beautiful forms.
We used Cloud Clay with a form inside, such as paper cups or leftover yarn cones, just what ever I had that seemed to match the children's form. They coiled around the form to create the bottle and created a fancy "stopper" for the top (if they wanted to). Before the bottle was closed they put a memory inside. This could be done with his or her imagination ( a thought was caught in the bottle) or by writing the memory down on paper and sealing it in the bottle.
Once the bottle was dry-ish, which takes a little extra time because the moisture is trapped inside, they were painted with Acrylic Glitter medium mixed with liquid water color.
The results were magical! I know that the students will remember this camp long after the bottle itself is gone!