1 (16oz.) pkg. Oreo cookies
1/3 c. melted butter
2 (4 1/2 oz.) pkgs. instant Pistachio pudding1/2 c. milk
Green food coloring
1 (8 oz.) Cool Whip
1 qt. vanilla ice cream

Crush Oreo cookies (hold out 6 cookies) and mix crumbs and butter. Pat crumbs into the bottom of a 9x13 pan. Beat pudding, milk, and food coloring (2 to 3 drops to add color) until very thick. Add softened ice cream. Pour pudding mix over crumbs; let stand for a short while. Spread Cool Whip over pudding mixture and top with remaining 6 cookies crushed. Refrigerate.