You do not need an excuse to have fun on Halloween. Just throw a party! Plenty of Halloween party themes exist; you just have to pick the right one.
The kind of guests that you have invited to your party will influence the kind of theme that you pick out for Halloween. If there are children involved, you need a theme that child-friendly yet still suits the mood of the day. For example, if you want to have a theme to revolving around the dead or ghosts, make sure that you incorporate child-friendly characters in your decor. Casper the friendly Ghost comes to mind.
If many of your guests have very conservative beliefs, anything that is sexually explicit will not be acceptable to most of them. That however, does not mean that you cannot find a theme that hints at romance yet still keeps everyone else happy. You could decide to go with a Gone with the Wind theme. Select a venue and decor to match. Have everyone dress in costumes which are from that era. Organized for a masked ball if you like. Nobody said that Halloween parties have to be scary.
If the preferences of your guests are flexible, then find a theme that pleases you. If you are a fan of Zombie movies, you could have a zombie theme. Create special effects that send chills down your guests’ spines. Have servers who walk around as zombies would. Create food that resembles dead bodies. Use your local cemetery as a venue for your party. Just make sure that you have the permission to do so!
You could also go with a vampire theme. It never gets old! You can organize a party based on a mystery. Appoint someone to be Count Dracula. Leave clues for your guests so that they can find the vampire who keeps on sucking people’s blood. Offer gifts to the teams that solve the mystery.
Halloween party themes can be anything you choose. Just get creative!