A couple of quite different cocktails that would suit a Halloween party:
Cadaver Reviver
22.5 ml tequila
22.5 ml orange liqueur
22.5 ml Lillet Blanc (or other aromatized wine)
15 ml Lemon juice
2 dash Absinthe
Nightmare
30ml gin
30ml Dubonnet/French rouge aromatised wine
15ml Cherry liqueur
25ml Orange juice
1 dash Orange bitters