Depending on the color of the walls, you could go with an ivory color for your curtains provided your walls arent that color because they would blend away if they were the same. dark brown like the furniture would be too overpowering since it would bring the darkness upward. a lighter shade of pink than that of the carpet would be a great choice and would tie in the carpet without giving the look of pepto bismol everywhere. you could compliment your furniture with a wooden rod in the same color. this would draw the eye upward.