Yellow and Pink is a classic color scheme for a girls room. Maybe a bright blue and green for a boy. Lime green and hot pink are complementary colors that would also go well together, if the kid likes bright and loud colors. Other examples of complementary colors are purple and yellow, green and red, orange and blue. It just depends on tastes and personality.
If the colors are very loud then the room can look smaller, but if the room is decorated in very soft, pastel colors then it can look like an adult's bedroom.
If the colors are very loud then the room can look smaller, but if the room is decorated in very soft, pastel colors then it can look like an adult's bedroom.