Pink Katydids
The Oblong-winged Katydid, Amblycorypha oblongifolia, is generally leaf green, although ocassionally tan or bright pink. The Audubon Insectarium, New Orleans, recently successfully bred some of the pink form. There are more photos here.
The insects feed on the leaves of woody deciduous plants and range from the Quebec province of Canada to Pennsylvania, from Pennsylvania SW to Texas, and from Texas N to Nebraska.