The sofa's upholstery could have natural earth tone colors or perhaps a floral print.
Leather, suede or any natural, earth tone upholstery would work for a casual country easy chair.
Paint three walls in a room a neutral or earth tone and then paint the fourth wall in a deeper hue of the same color.
For a bold look, choose an interior paint in a rich earth tone like brick or clay.
Many color schemes will work with contemporary style including earth tone colors like Churchill Hotel Maple, Autumn Russet and Roasted Coffee.