We recently bought the McKenzie Duvet for a bedroom we're redoing, and looking at your comments from our post this morning on the headboard for the room, we're not the only ones who love it.
The duvet and matching shams are available from Pottery Barn in yellow and a deep blue, and are currently on sale for $26.99- $89.99. See the bedding here.
The yellow duvet cover is only available in a Cal. King right now, but you can easily take it to a seamstress and have it sized down if you have a smaller bed. The McKenzie fabric is also available by the yard if you're feeling crafty.