Trim off the ends of each cucumber. Using a vegetable peeler, remove 3 evenly-spaced strips of peel from each. To make cucumber cups, cut each crosswise into 1-inch-thick slices and use a teaspoon to remove the seeds from the center of each without cutting through to the bottom. Transfer to a platter; set aside. In a food processor, purée cottage cheese, yogurt, 2 tablespoons chives, pepper and hot sauce. Spoon mixture into cucumbers, top with a sprinkling of salmon, olives or ham and garnish with remaining chives. Cover and chill for 1 to 2 hours before serving. (Filling can be made up to 1 day ahead.)