Heat oven to 350°F. Spray 8x4-inch loaf pan with cooking spray. Sprinkle pecans evenly in bottom of pan.
Place cinnamon rolls on microwavable plate. Microwave uncovered on Medium (50%) 10 to 15 seconds. (Rolls should still be cold for easier handling.) Cut each roll in half. Arrange rolls pieces evenly over pecans.
In small microwavable bowl, microwave ice cream, topping, butter and contents of the 2 icing packets uncovered on High 1 to 2 minutes, stirring once, until melted. Stir until smooth; pour over rolls.
Bake 22 to 25 minutes or until biscuits are golden brown and no longer doughy. Meanwhile, line cookie sheet with foil. Place foil-lined sheet upside down on loaf pan of rolls; carefully turn over. Leave loaf pan over rolls 1 minute. Serve warm.