Now for our purposes I changed things a little bit.
First I used air dry clay. You can find the recipe here.
Second, instead of rolling out the dough and using a cookie cutter technique, I had the kids roll the dough into a ball, and then flatten out like you would a cookie using a piece of aluminum foil so they could transport it home while it was still drying:
From there we followed the rest of the directions. Imprint the clay with foliage and then the dinosaur.
And the final outcome: