Mix 1-1/2 cups wafer crumbs, sugar and butter in 13x9-inch pan; press onto bottom of pan. Refrigerate until ready to use. Beat cream cheese in medium bowl until well blended. Gently stir in half the COOL WHIP; spread over crust.
Add boiling water to gelatin mix in medium bowl; stir 2 min. until completely dissolved. Add enough ice cubes to cold water to measure 1-1/2 cups. Add to gelatin; stir until slightly thickened. Remove any unmelted ice. Spoon gelatin over cream cheese layer. Refrigerate 3 hours or until firm.
Spread remaining COOL WHIP over gelatin just before serving; sprinkle with remaining wafer crumbs. Decorate cookies with icings to resemble tombstones; insert in top of dessert. Add candies.