For the fabric, I chose flannel because it is soft and it was on sale for $2.99 a yard at Jo-Ann. I also bought three bags of Poly Pellets and a bag of Polyfill. I looked around at the blankets for sale and decided on making a approx 36" x 50" blanket with 5 pounds of Poly Pellets and also stuffed lightly with Polyfil for extra comfort (Adele likes pillows). The blanket has 6 columns and 8 rows for a total of 48 "pockets" so I put 1.6 ounces of pellets in each pocket (a kitchen food scale helps). Overall, it cost me about $30 to make and took about 4 hours.
I am still judging its effectiveness. She has been sleeping through the night while wearing it but I am still working on seeing if it makes a difference in getting her to go to sleep. I also bought a remnant of My Little Pony fleece which I am planning to make into a weighted lap pad. I just have to decide how many pounds I want to put into it.