Step 1: Materials

A box of wax crayons
Glue
An oven
Some aluminium foil

Step 2: Assembly

Carefully cut the seam of the crayon-box and turn it inside-out. Apply some glue and reform the box to make a plinth.

Cut a ring from the cardboard tube, or otherwise make one. I found that a standard British toilet paper tube is just the right size. Pack the crayons in the tube, hexagonally.

Apply glue to the bottom of the crayon-pack, and work it down the cracks (e.g. with a pin or piece of wire) . The glue will hold the crayons together well enough, and secure them to the plinth. Add the crayons to the plinth and allow to dry. I used 2-part epoxy: strong & heat-resistant.