Fire and ice lights create an interesting effect, and projection lights that send glowing spiders crawling over your house are a quick way to decorate in a pinch, but the use of high production-value projections from the likes of AtmosFx and TheSingingPumpkin seems to have skyrocketed in 2017.
See the whole list here: https://horrorconsulting.com/top-5-motifs-2017/
