Weddingbee boards

Orange sherbert with "eyeballs" made out of marshmallows maybe? And of course, some dark soda, like that purple mountain dew, plus some sprite to tone it down. Think green, purple, and orange. Do you have access to dry ice? that would be ideal and would make your drink look foggy! It's such a cool look. 

Try this site: http://www.drinkoftheweek.com/special/halloween.htm although most are alcoholic you can always replace the vodka with like, more sprite.

A green "grog" type punch: http://allrecipes.com/Recipe/Green-Punch/Detail.aspx this sounds REALLY good

Whatever you make, float ice "hands" in it! Fill up a latex glove with water, tie it off, freeze it, then rip off the latex and dump them in the bowls. Walla-you have hands!!

Jello is also good--toss some jello cube in to give it sort of a chunky look. I'm not 100% sure how you could mix jello with drinks....but it could be fun. Maybe too gross for a punch though.

@jacqi, if you make cider with red wine instead, it is FABULOUS.

Use one bottle of an inexpensive red wine (medium, not too dry not too sweet), then add half a bottle's worth of water, then add in like, half a cup of brown sugar. It is so insanely fabulous. PERFECT for winter. It's a family tradition.

that could make for a funner work party though....even tho funner is not a word, lol.

just sub it for cider or something neutral, like ginger ale.