Most of the ones that I would nominate have L&M roots or influence. KE, Spring Valley, Skokie, Beverly, and Mount Prospect come to my mind as the most exciting greens in the area. Old Elm's are terrifying, but memorable and varied. OFCC South has some really cool ones (#1, 5, 6, 7, 9, 10, and 11 in particular, but they aren't as consistent due to some borrowed holes from the #2 course and the newly created 3rd. I've only played it twice since the renovation, but Medinah #2 has some stellar greens as well.
Since it is so flat here, you have to either have great greens or great bunkering.