In the Obstacle course part 2 - Creating particles for the pickup scene we learned to change properties and make those particles shine with cool animations. On the Angular velocity we made it go 180 degrees with Random of 1.0 (0 - 180). How would we approach if we wanted a randomness from (-180 to 180) degrees?
If you just want to have a greater range, crank the angular velocity to 360, that is effectively the same range as -180 to 180.
If you want to rotate in two different directions, then that is not possible; you may be able to use two emitters with different settings, that may work, but I didn't try it.