Polka dot is a pattern consisting of an array of filled circles. They are most commonly seen on children's clothing, toys, and furniture, but they appear in a wide array of contexts. A polka dot pattern fits any child or adult's personal style.
You can still enjoy rainbow nail art designs with matte nail polishes. Choose a black matte as the base so the colors will really be distinct. Then put those dots depending on your design. Must look at the rest of the designs