A par 3 I like has been built by Bob Cupp once, and protégé John Fought several times - short par 3, elevated green, single DA type bunker in front, fw height chipping areas falling away on all sides.
Yes, CBM had the short hole, and there is PV 10, but I feel like the fw chipping area fall off improves it and makes it a different enough hole to consider in America. Brits might just consider it another postage stamp.
Another version might be the dreaded "straightforward" par 3 - medium to long, green surrounded by 2-3 sand bunkers, basically, the accuracy test on a longer distance. Some architects have taken to making these very long, figuring its the only way to test long players with a long iron.
And, as mentioned, the pond on one side, pretty wide bail out on the other, usually downhill. Also, mid and forward tees angled so they play less directly across the water than the back tees to ease play for average players. Pond size, length, and bail out area are all adaptable to many lengths.