Glittery glue dots - for magnets! It looks like those glass filler stones (or maybe dried resin or glue? hmmm), and glitter for the materials - No instructions, but it seems pretty simple going from the pictures.
have shapecrete already pressed down into a plastic lined bowl, level the top. Paint leaf and second bowl with oil and press down into the first bowl (maybe weight second bowl with water?) no instructions at click through but lots of ideas