Up until patch 2.1.0 (05/22/2007) [not EXTREMELY sure about this, it could have been later, but definitely not earlier], every time a Rogue's poison would proc, a green bubble would appear on his hands and follow his weapons wherever they went, creating multiple bubbles, like this:
The animation for the green bubble appears to be "Nature_cast_hand.m2". The last picture, its animation, is "SpellCastDirected", and it seemed to happen when the poison proc animation went off, you moved, and used a special attack (gouge, eviscerate, kidney shot, expose armor, ect) all at the same time. The picture above is gouge, which is why the center of the green bubble is purple.
Anyway, if someone could somehow figure out a way to get this back, I know myself and a LOT of other Rogues out there would be extremely happy!
Thanks.