Development of artifacts and symbols associated with Halloween formed over time. For instance, the carving of jack-o'-lanterns springs from the souling custom of carving turnips into lanterns as a way of remembering the souls held in purgatory. The turnip has traditionally been used in Ireland and Scotland at Halloween, but immigrants to North America used the native pumpkin, which are both readily available and much larger – making them easier to carve than turnips. The American tradition of carving pumpkins is recorded in 1837 and was originally associated with harvest time in general, not becoming specifically associated with Halloween until the mid-to-late 19th century.
The imagery of Halloween is derived from many sources, including national customs, works of Gothic and horror literature (such as the novels Frankenstein and Dracula), and classic horror films (such as Frankenstein and The Mummy). Among the earliest works on the subject of Halloween is from Scottish poet John Mayne in 1780, who made note of pranks at Halloween; "What fearfu' pranks ensue!", as well as the supernatural associated with the night, "Bogies" (ghosts), influencing Robert Burns' Halloween 1785. Elements of the autumn season, such as pumpkins, corn husks, and scarecrows, are also prevalent. Homes are often decorated with these types of symbols around Halloween.
Halloween imagery includes themes of death, evil, the occult, or mythical monsters. Black and orange are the holiday's traditional colors.