Preheat your oven to the temperature suggested on the clay packet.
Cut your clay block in half with your knife to make the whole thing thinner.
Cut triangles from this thickness, about an inch tall. These will be your actual holders.
Use your knife to cut down the middle from the top of each, just stopping short of the bottom. This will provide the slit for you photos/postcards to sit in.
Cut the remaining clay in half again so it’s left even thinner than before but not so thin that it becomes really flimsy.
Cut out medium and small triangles from this new thickness, to be used along with the larger ones later.
Place all of these on a tray lined with foil or baking paper and oven bake for the length of time suggested on the clay packet.
Once baked, leave to cool so all the shapes have hardened. And then, paint the tips with the metallic gold nail polish and leave to dry.
Now you can assemble the mountain holders. Squeeze a little all purpose glue on either corner of a large triangle and sit a medium and small triangle against it to create the look of a mini mountain range.
Make sure they sit flat against the ground and leave to dry. Repeat with the remaining shapes.