You've got to ask yourself, how do you want your room to make you feel?
If your room is used for a lot of family time, such as the Kitchen, Living or Dining Room, you might want to look at warm greys. There are many ways to bring colour into a room, through Blinds, Drapes, Cushions, Throws, Upholstery fabrics, Feature walls, and paintings.
Once you choose your mood, it is time to look at colour schemes, here are the basics,
According to The Color Scheme Bible by Anna Starmer:
Pink: fun, lively, positive and feminine
Red: passionate, daring, intimate, comforting, stimulates appetite
Orange: stimulates creativity, evokes warmth and coziness
Yellow: welcoming, sunny, and linked to promoting intelligence
Green: tranquil, invigorating, restful and balancing
Blue: clear thinking, calm, meditative
Violet: stimulating, sexy; blue-violets are cooling, spiritual