Here's a no brainer, Lambertville's La Chocolate Box, has its window filled with vintage-look cat and pumpkin-head figures. They also have black branches woven with a black bulb light string to create a spooky thicket against the glass while black vines and bats lead to the ceiling where a dark canopy awaits.
The Goody Bag & Basket Company in New Hope, PA has never been a shrinking violet when it comes to the macabre. Here they show off a split personality with a warm orange window and a sinister green window. The former with autumnal decorations and Jelly Bellies. The latter features everybody's favorite green, electrified, Victorian monster and old favorites like Pop Rocks, wax fangs and licorice pipes. I like the juxtaposition of the two seasonal windows.
Where do I find brilliance? All these windows make great use of vertical elements, the vines in Lambertville, the tree in Frenchtown and Frankenstein with green lights in New Hope, that move the eye both up and down to take in the entire scene rather than keeping the elements at normal eye-level. Although it is difficult to see in the pictures they also suspended things from their respective ceilings which is great way to get more elements into your scene and make it more robust. Additionally, everybody was well merchandised with smaller thematic items.
Don't let these frightful windows scare you off, take a trip downtown and see how your own Main Street is celebrating this season. While you are there you may want to pick up some sweet indulgences for yourself, how much is between you and your dentist.