Spoon ice cream into cookie crust. Sprinkle with crushed cookies. Freeze 8 hours or until firm.
Line cookie sheet with waxed paper. Spoon melted black candy into resealable food-storage plastic bag; cut off tiny corner of bag. Pipe 4 (3-inch) trees and 1 cat onto cookie sheet; refrigerate until firm. Pipe RIP on each cookie. Let stand until firm.
Spoon melted white candy into resealable food-storage plastic bag; cut off tiny corner of bag. Drizzle over candy bars to look like mummies; add 2 chocolate chips to each mummy for eyes. Refrigerate until firm.
Insert trees, cat, mummies and cookie tombstones in top of pie. Cover; freeze 2 hours or until firm. Freeze any remaining pie.