Image by Carole Pasquier, labeled under CC-NC, source found here
Halloween as it is in the present day has evolved as a commericial holiday from its origins as such from around 100 years and its traditional origin of over 2,000 years ago.
Nowadays, you can find all sorts of interesting new ideas put into modern cultural surrounding the ominous month of October. The use of scary elements oter than ghosts have been a relatively new addition to the holiday (Well, specific ones anyway; things such as ghouls and monsters have been a tradition for longer than that).
There are plenty of these kinds of traditions added over the course of a hundred years or so of development. Some examples of which include the following:
In fact, the 1950's, while the national holdiay had been around for awhile, was a great time for horror movie classics to appear on masks eveywhere.
A relatively new trend that has emerged diverges from the "scary" Halloween is supposed to be: Dressing up as ficitional character from popular media.
A side effect of our information age is that cartoon, movie and book characters get popular fast, and has been a contributing cause for making Halloween a more fake kind of scary than something of actual frieght.
Click to to see the Origin of Halloween
Click to to see the Development of Halloween