Feline Eyes (Patreon)

Maxis-adjacent slit-pupil eyes for all your monster and cat people needs. All eyes are  non-default, have in-game thumbnails to easily find them in CAS, and have been divided into three separate packages, including twelve natural colors based on actual cat eyes, twelve variants of sectoral heterochromia, and fifteen fantasy colors. If you want all three, you can download the merged all-in-one package that  contains every swatch (do not install the individual files if you’ve installed the all-in-one).