Powder pink works well with shades of grayish brown. Choose one color to be the dominant color and one to be the accent. Use a lot of pink and just a little bit of brown, or a lot of brown and just a little bit of pink. The accent color should be found in the pillows, curtains and some of the accessories in the room, including knick-knacks. Powder pink is most appropriate in a room for a female, although this would also work for a couple's bedroom.
Baby blue and brown combine to make a more masculine combination than pink and brown. Again, pick one color to be the dominant color and one to be the accent color. This is appropriate for the room of a female teenager or for a couple. If you're looking for a second accent color, consider cream or different shades of blue or brown.
Gray and brown are a fabulous combination for any gender or age group -- in fact, it works very well for children because it doesn't easily show dirt -- but be careful that the room doesn't become too dim or gloomy. Use accents of cream or white dispersed around the room to keep it light and pleasant. Use shades of grayish brown rather than warm shades of brown so that the brown and gray will not clash.
Colors like red, gold and copper are best used with warm shades of brown. Use brown as the dominant color to prevent the room from becoming intense and overwhelming, or use dull, earthy tones of the other warm colors. This color combination works well in a room that gets less natural daylight than some others. It can be overstimulating in a room with a lot of natural daylight.