These cat eyes were made using a paper-piecing pattern that was created by Soma Acharya, from Whims and Fancies.
After completing the first eye, I realised that I forgot one piece. It was supposed to be right at the tip of my seam ripper, in the picture below. Hmmm.
Thankfully, I was working with non-fraying fabric (old t-shirts) and was able to add the missing piece without too much trouble.