Why not make some lime jelly and put in it some of those jelly eyeballs that are everywhere just before Halloween. If you make it in a mould rather than a bowl and face the eyeballs down, when you take the mould off you should have some very spooky eyeballs staring back at you. Then there's eyeball cupcakes (I might have a bit of an eyeball 'thing'), which are easy to make. Just white icing, black dots with a circle of blue/green and some red cracks to the edges. Or you can use the jelly eyeballs again in the middle and just do the bloodshot cracks. Vampire blood juice - cranberry and pomegranate with a few sweets floating in it, e.g sugar free worms for the kids or a good dose of red martini etc if it's for grownups.