I love the trend to "decorate" a house for Halloween with light shows! Here are some of my favorites.
This first video features a perfect background and a series of "RIP" tombstones in the foreground. LOVE IT (although the song is terrible):
This video features a simple yet INCREDIBLE projection - created with just one very powerful projector, careful placement, and lots of creativity:
Even if you don't have a house to decorate, how about a series of pumpkins?