Two rulesets popped up and grabbed my attention during my studies on the affects of boundary condition -- Ruleset 073 and 109. Not only are they highly volatile to changing boundary conditions and field widths, there are two things notable. First, they are the only two rulesets to show the vertical pipe condition:
The second is that they can be made to look like they came from the same ruleset simply by changing the active/passive color to white/black in one of the patterns:
Certainly deserves closer scrutiny.