One of the easiest and cheapest ways to welcome the new Fall season is to do a fresh Fall nail colors 2021. As long as you swipe your favorite nail color, you have successfully transitioned to the next big nail trend. And you can also update your image. So, what is the best nail polish color in the fall of 2021? Rebecca Isa said that several hot colors are emerging from the deep pink on short nails, to the inspiration of rainbow colors, the ombré nail art. And the rich, highly reflective metallic colors.