Farrow & Ball Mouse's Back No. 40This grey brown classic takes its characterful name from the fawny colour of the British field mouse. Much like its namesake, the green based Mouses Back is quiet in nature and feels soft in rooms both large and small. It will read greener when used on the walls of underlit rooms and is the perfect accent on furniture or floors when combined with more traditional shades such as Setting Plaster and Lime White.