The Postage Stamp is the first hole that comes to mind, though that is perhaps too similar to the 7th at Barnbougle in playing characteristics?
Skinny, perched target with varying amounts of death to either flank. Deep enough, so that good distance judgment is important to give a chance of making a two. Importantly, the front is well protected too, limit the low running shot in.
You could probably class the 6th at Dornoch in this category too. Both of those examples hold onto a bigger landform. Without that, they would likely be more intimidating, but less beautiful?
I struggle to think of any great short par-threes that sit at grade...!?