The best result, in my opinion, comes from lining the inside of the jack-o-lantern with aluminum foil and using the pumpkin as the heat-safe container. Get carving: Our free pumpkin patterns are full of ideas for Halloween jack-o'-lanterns. From emoticon stencils to eerie face templates, print designs for all. From emoticon stencils to eerie face templates, print designs for all. The jack-o-lantern face in this printable Halloween pumpkin stencil has a scowl a mile long. It makes for a better design than the first example if you are looking to create a grim mood. Apply his long scowl onto a Halloween pumpkin with a stencil and put a scare into the Trick or Treaters!