Frankie's Girl posted some great recipes on another thread:
http://www.halloweenforum.com/party...g-cake-undead-cupcakes-murdered-cupcakes.html
and Britta has an amazing tasting bleeding heart I've made before and it rocks mighty:
Halloween Recipes
For alcoholic drinks, how about a bloody mary (har har)
nonalcoholic - Sparkling grape juice (May need to add a drop or two of red food coloring just to make sure you get a red color) And some Eye-ball ice cubes (Basically red peeled grapes suspended in ice) Martha stewart has a eyeball ice cube recipe using veggies that would taste amazing in a Bloody Mary.
http://www.marthastewart.com/article/eyeball-highball
Personally, I can't stand Twilight, but I know you really enjoy it. You could always have a Team Edward/Team Jacob thing going on in the party. Or A Twilight drinking game. I work at Borders and we had to do 3 Twilight parties. I can't really remember what exactly we did party-wise but when I can get a hold of the manager that use to work with me, I could get the game list from her for you if you'd like.
Hope this helps out some.