Dissolve 2 packages grape Jello as directed on package. Allow to partially set. Whip Dream Whip as directed on package.

Mix one can blueberry pie filling, Jello and Dream Whip until it has a marble effect.

Press graham cracker crust in bottom of 9"x13" pan, reserving some for on top. Add filling. Sprinkle with remaining crumbs. Chill.