We have two 100% cotton pillowcases from Ikea that fit zero of our pillows (too small), shown at top of first image. I took out all the seams, and it unfolded into one large piece of fabric, which i then cut in two (the bottom two pieces of fabric in the first image), the smaller of the two became my pillow, and the other will be the pillowcase. The stuffing is leftover 100% merino wool, that wasn't dyed, from sheep here in Spain.
dLana wool. I don't have the tools for carding, as raven ranson recommended, so I stuffed it and hoped for the best. It already seems much softer than a pillow I had previously stuffed with cut up bits of old wool sweaters (cut into about 1" squares), inspired by jennifer and inge's posts on the first page of this
thread. That sweater stuffed pillow is perfect for a throw pillow, but too lumpy for sleeping on. So excited to try out the new one tonight!