Pumpkins are everywhere in the 2015 film Hellions, directed by Bruce McDonald, and reviewed here by Outpost Zeta. Seventeen-year-old Rose discovers she's 4 weeks pregnant on Halloween. There are sinister trick-or-treaters. There are pumpkins.
And if you're making these treats for Halloween, why not just fill the hole in the middle with something that looks gory so when you cut into it, it oozes like blood? Raspberry jam or cherry pie filling maybe?
Caveat: You'll want to check both the boxed mix and the frosting for lard. If all else fails, of course you can make your own frosting. The egg in a spice cake recipe can easily be substituted by using 1/4 cup of pumpkin puree or applesauce, by the way.
Find the recipe here at the Betty Crocker site: http://bit.ly/2e161dv