I went To Tah-Jay (Target) one of my faves, and bought a king size black duvet set on sale $20.00, (for a queen bed).
I took a large flat rate priority mail box (12" x 12") and marked my blocks and my middle x's.
Then, I made this strip that is 1/2" wide, and pinched the pleats, and hand sewed and tied them, one by one. Took a bit of time, but that is what trashy TV is for.
For the amazing finished look, go to my daughter's blog. Bangbylo . She shows the finished duvet on her bed with her new sheets. (It is a couple of posts down, she is faster than I am at posting) It looks great if I do say so myself. It also gives the links to the great instructions of the other bloggers that had done it before me, and I used their great instructions. Hope over and take a look. Totally worth it.