If you want a really awesome visual effect, while at the same time totally grossing out your friends, try the Brain Hemorrhage Shot:
If you want visual effect, without the gross out, and you know how to use a candy thermometer, then maybe a hard candy blood drip rim on your glassware is more your thing:
here at hostess with the mostess. You'll need some sugar, karo syrup, water and red food coloring to make it. The martini glasses are awesome, but I'd guess it would work on highball glasses, rock glasses...really any glassware. Another site mused about possibly using plastic glasses, but wondered if they'd melt, which I'm guessing the probably would.
So, you've got your blood rimmed glasses, but what will you serve in them? Anything red will do. Anything containing cranberry juice or grenadine would suit it well. Or, what about the Vampire Kiss Martini:
It's 1 1/2 oz vodka, 1 1/2 oz champagne, and 3/4 oz of Chambord. They also suggest red sugar for rimming (if you don't do the hard candy blood rim) or dropping a set of wax vampire teeth in the bottom. To assemble, after rimming (or whatever), pour the vodka and half the Chambord into the glass. Top with champagne. Pour in the remaining Chambord over the back of a spoon to make it float.
For more ideas and inspiration, Webtender has a whole list of halloween drinks, including a couple of non-alcoholic varieties.
Are you serving up anything special for Halloween this year?
Bottoms up, and Happy Halloween!