The shot glasses worked well...
I have used them before for cocktail parties and they were much better sutied to tha method, as they can get refilled and passed again - I have done gazpacho, consomme, chilled cuke and chilled lettuce soups - this one was relly nice and refreshing also, and because it was part of the buffet it worked well - I had set up a small table on the side, and people were "shooting" the soup as they waited in line for food and leavng the little glasses there...
Bloody Marys would be greta in the shot glasses, especially if they're really strong and horseradishy - if you have a glass eye-dropper (new, obviously) you can drop one drop of very peppery extra virgin olive oil on top so it makes a little bubble-type...