Whether for cost reasons or other concerns, there are those who prefer their comforter, duvet and pillows not to be filled with real down. If you are one of these people, then you will be happy to know that there is a wide variety of comforters that use other fabrics as an alternative to down. And if blue is the color of your bedroom, you should be able to find a bedspread in various shades of the color, from light to dark.
I like how masculine this one looks:
Blue down alternative comforter pictured: Newpoint Microplush Corduroy Comforter Mini Set, navy, available in twin, king and full/queen
While it is true that down is expensive, there are those who will argue that alternatives cannot match the comfort it provides.