The marshmallow creme makes me think too much about fudge and rice krispie bars. If my daughter finds out I have it on hand, I get begged to make that.
For Halloween, I had added some red and yellow food coloring to the rice krispie bar mixture until it was nicely orange, then stirred in some candy corn. I pressed that into a pan and then did the "graveyard" thing on top of it, adding marshmallow ghost shapes as well as more candy corn and candy pumpkins. It was very well received. :)
Here is a pic of it:
Kreepie Krispie Treats
If anyone needs the recipe. you can use just about any old rice krispie bar recipe if you have one, and just add the stuff. I figure most people have that so I will wait to post if someone needs it. Just let me know. ;)