I bought this basic pillowcase and pillow insert from Ikea. While it's nice and big at 26" across it's also boring to have a plain white pillow. So with some painter's tape and fabric paint I made this striped circular gradient effect.
Step 1: Prep pillowcase
To get the pillowcase ready, I put down several pieces of painter's tape across it like in the picture here. I also put a piece of cardboard inside for a better painting surface and to prevent paint from bleeding through to the other side.