In food processor, process crumbs and candy bars until candy is finely chopped. Add butter and process to mix. Press mixture over bottom and sides of 9-inch pie plate. Refrigerate 30 minutes. Scoop ice creams into pie shell, alternating flavors and drizzling layers with caramel sauce. Freeze 3 hours or until solid. Let sit at room temperature 10 minutes. Before serving, sprinkle with diced candy.