To fill the pillow, use a 20 x 20 pillow insert, I found mine at ikea. Also, to make this tutorial simpler, you could just skip the cording step. And if you are not a sewer, you can buy a similar version here.
Next up on my to do list… a headboard. I think these pillows would look great with a light gray/blue headboard like this one.
If you have any questions, don’t hesitate to ask!