You can spice up any Halloween party by doing Halloween face painting and introducing the following games:
Blow up some orange balloons, place some prizes inside and scatter across your backyard. Kids need to step on them to get the prize. Another variation is to glue them on the wall in a form of pumpkin and ley the kids pop them.
This toilet paper mummy game. The team that finishes their roll of toilet paper first making a mummy, wins.
Pin the Tail game can be modified into pin the face on the pumpkin game, or other Hallowing characters.