I loved The Edge (I think it was called). It always seemed to be in auto-arcade-game-mode and made everything look very 80s (in a good way), but with a bit of care you could turn it into glorious line drawings.
I'm sure I got a lot of use out of a classic kaleidoscope as well, unless I imagined that and it was always a CI or Quartz actor of the same name. Rarely used it as an actual kaleidoscope but it was a really quick way of creating single reflections. In workshops people love 'disappearing' into themselves or dipping under water with a horizontal reflection.
I'm sure I used TimeBlur fairly regularly, although I'm not sure I ever fully understood it. Wasn't there a TimeWarp as well? If not, there should have been.