I had a white down comforter on my bed for a while, but the stark white and the bright blue walls in my room were almost blinding during the day. I finally found gray sheets that were perfect and decided to make my own duvet. Ideally you would use two flat sheets one size larger than your bed (queen sheets for a full size duvet etc). I could only find one set so I had to make the fitted sheet work. I just put the right sides together and sewed down the two long sides and one short side leaving the top open. I intend to put buttons across the top to close it, but it hasn't happened yet sometimes I procrastinate...a lot. And it's done, the duvet was crazy easy to put together and a much cheaper option. It would be great for kids rooms too, you can always find super cute printed sheets.
Now to make a bed skirt, maybe I will get around to it soon. I love the way my room turned out, it is definitely not for everyone. We had company over a few weeks ago and she gave me the best compliment when she said my room looked like me. That is the best to me, a room/home with your personality.