Old Fashioned Brussels Sprout, Celery and Macaroni Soup

Fast and basic recipe, at Freerecipe.
http://www.freerecipe.org/Soups/Vegetable/BrusselsSp_bbegd.htm

Company Creamy Brussels Sprouts Soup

Prepared with sour cream and chicken stock.
http://www.cooks.com/rec/doc/0,1848,159184-243207,00.html

Cream Of Brussel Sprouts Soup

Made with cream, potatoes, and nutmeg.
http://www.cooks.com/rec/doc/0,1748,158179-251203,00.html

Brussels Sprouts Soup

To serve, sprinkle with nutmeg or croutons. Alternately, swirl a little light cream in the soup before serving. Serves 4.
http://www.cooks.com/rec/doc/0,1948,154179-230193,00.html

Brussels Sprout Soup with Tofu Sour Cream

A fast recipe making six servings, at Vegweb.
http://vegweb.com/recipes/soup/1253.shtml