Cynthia Taylor-Luce Not sure if the person who posted will respond, but I can advise you that window seats are variable sizes so an upholsterer is your best friend to supply the foam and cover it for a cushion that fits your space.
Valspar's Gray Silt is a similar gray/green
The wall color is Pratt & Lambert Winslow Grey and the trim color is Pratt & Lambert Balsa, hope this helps!!!