We all paint our nails for different reasons but I do it in the name of focus. Nothing keeps me on track like colors. I need it so bad that I would go crazy (literally) if I would go one day without painting my nails or forced to wear black all the time. It helps me to be attentive and because of that I easily pay attention to everything around me. The brain is fast at adapting to things so I have to change color/style often (not that I mind) and one style that works best for me is to paint one finger in different way from the others. Since you move around your hands and fingers a lot will your brain tell you “but wait, something is different on your hand”, so you pay attention to that and many other things around you.
Glitter nail polish from AA called “Supernova”.