I adore TwistedCat's Faded Eyes but I'm always looking for more variety when it comes to colours, and when I found that the PSD file for the eyes were on TwistedCat's Patreon I couldn't resist! The Scientist palette is full of neutral tones and it's perfect for your more mature and serious sims. The SecondaryDisplayIndex is set to 2000 so they should all be grouped together and not mixed in with default eyes, but if there's a problem with the way they're appearing in game please let me know.
Credits
Many thanks to TwistedCat for not only creating the original default eyes but also sharing the PSD for them to be edited. Being able to edit them wouldn't have been possible for a novice like me if the PSD hadn't been made publicly available.
Credit to Sims4Studio and CAS Tools for the ability to create a package for these eyes and also to reorder the SecondaryDisplayIndex.
Credit to SerindipitySims for the Scientist Palette, the gradients and the palette graphic.
End Note
If anyone has any other palette suggestions, don't hesitate to send me a message!