Just bear in mind that you should be comfortable with the nail art you choose for Halloween. Make sure that the nail art does not chip easily and will not damage your costume in any way. It would be bad if either one of your nails or your costume will get damaged when you are out there trick or treating.
Go neon with this bright and bubbly looking Halloween nail art design. Use black and other neon colors as your base coat and paint n random shapes and lines on top using contrasting colors. These look even better at night.