Place first 3 chocolates work bowl of food processor or blender; finely chop chocolate. Heat cream to just simmering point. With machine running, gradually add the cream, mixing until the chocolate is melted. Scrape down sides of container to make sure all of the chocolate is melted. Blend in liqueur. *Use whatever flavor liqueur you wish; suggestions are: rasberry, almond, peppermint or orange liqueurs. Cover a cookie sheet with wax paper; butter paper. Spoon mixture into a thin layer onto cookie sheet. Refrigerate until chocolate is firm, about 30 minutes. Return to a work bowl or blender. Process until light and fluffy, about 30 seconds. Spread on cookie sheet again and refrigerate until choc. can be formed into balls, but is not hard, about 20 minutes. Carefully shape inti 3 cm balls. Freeze until firm. Melt 6 ounces sweet baking chocolate in small heavy saucepan over low heat. Dip frozen chocolate balls into melted chocolate to coat. Place on wax paper-lined baking sheet. Sprinkle lightly with cocoa. Keep frozen til ready to serve. Yeild 5 dozen.