Tom MacWood,
Ridgewood (NJ) has a fabulous, expansive, well contoured putting green, that flows into a fairly level surface at the far end, next to another, smaller practice putting and chipping green.
Winged Foot has a similar, huge, practice putting green that replicates many of the golf course greens.
GCGC's practice putting green is also large, and blends in witht he 18th green, ala Oakmont. The green is sloped, which matches most of the greens on the golf course.
I would imagine that the cost of land and the cost to construct, and the current USGA recommended construction methodology might be the reason that these types of greens are rare.
Montclair (NJ) has a similar practice putting green.
Large and pitched like many of the golf course greens.
The Knoll used to have a practice putting green that was similar, but a clubhouse fire resulted in its demise.