Rather than carving the pumpkins this year I picked up some adhesive backed felt for about a dollar. I found a Frankenstein's monster stencil with a quick internet search (from here).
Just trace the pattern onto the back of the felt and cut out with scissors. Peel off the backing and apply the felt to your pumpkin.
Frankenstein's monster only took half a sheet so I also drew some bats and cut those out for the next pumpkin.
My mantel this year:
And I saw this idea on a couple of blogs (one here and the other I can't find again. oops). The second blog is where I saw the idea for the mummy marshmallow. So cute! All it takes is a bag of marshmallows and multi-colored sharpies.