What colors should I redo my bedroom with?

Im having trouble finding a comforter I like. I don't know what colors I want but Im 16 years old and I want something mature but not too mature. I want my room to be sophisticated. I have a really big room. I can paint my furniture any color and my walls any color. My bed is grey and wire framed. Its a queen and high off the ground but not too high. Ive looked everywhere (pottery barn teen, target, walmart, kohls, jc penney, etc). Im open to ordering off the internet. Please add links to comforter sets! Thank you!