Materials:

500g air hardening clay
3 tealights
A sharp knife
Glass of water

Steps:

1. Divide clay into three portions. Form each portion into a pebble shape.
2. Press your thumbs inside the clay to make an indent for the tealight. Take a tealight and press it firmly into your ball of clay. Ensure there is enough room to be able to easily remove or replace tealights once dry.
3. Place knife into the glass of water. Carefully slice pieces from the clay, forming flat geometric shapes.
4. Once you are happy with the shape smooth down the slices with a cloth. Remove tea light.
5. Allow clay to dry overnight or for 12 hours.