Just have a look at Google images and search for Halloween.
Plenty of ideas to find there.
This image made me laugh and I just had to paint it on my nails :D
For today's nail art I used the following polishes:
- Catrice Ultimate Nail Lacquer 39 Black To The Routes (black)
- Goodmark Nail Enamel B13085 (white)
- Kleancolor Nail Lacquer 234 Chunky Holo Purple (holo glitter)