Things that would improve the display from this project, that were not done this time.
Multiple lasers would allow for a more dazzling display.
Plastic mirrors that can be warped creating a more diverse show.
Larger diffraction disc would create a faster transition and more transitions.
slightly faster motor increase the rate at which the transitions occur.
Possible multiple motors/diffraction disc overlapping multiple diffraction disc, space within the box would be the limiter.