I wanted my bedroom to be calm and relaxing. I don't have a television in my bedroom, and it's too small for any sort of seating area, so it functions primarily as a place for unwinding and resting. Cool colors are the most soothing to me and purple is my favorite color; the color scheme evolved from there.
Colors used in my room:
Purple, Teal, Silver, and Cream
Tips for using color successfully:
Choose what you love and then stick to it. I'm the worst at impulse buying anything cute or sparkly, so I have to be very strict with myself about my color scheme. If it doesn't fit with my color scheme, I don't let myself buy it. I do try to keep a similar color scheme through my apartment, so when I find awesome stuff in my color scheme, I can buy it knowing it will work in any room and in any apartment down the road.