I know the grasses can be a challenge to ID, but thought I'd give it a whirl. I photographed four variegated species over the weekend which were all approximately 12" or less in height and this is the last of them. All were on display at local public gardens so I presume they may be cultivars available in local nurseries in upstate NY area.

This particular grass was situated in full sun as an outer surround for a new water feature installed by a professional landscaping company. It was not being used as a bog plant and does not appear to be receiving any supplemental water. These were planted recently and are showing some signs of slight browning from the lack of consistent rain in our area. The small clumps of grass measured about 6-8 inches in height with a spread of between 8-12 inches (so far).