Amba, Tara, Shorashi, Bhuvneshwari, Chinnamasta, Bhairavi, Dhoomavati, Bagala, and Matangi are forms of Durga worshipped in Gujarat during the nine days of Navratri.
Amba, Chamunda, Ashtamukhi, Bhuvaneshwari, Upang Lalita, Maha Kali, Jagdamba, Narayani and Renuka are forms of Durga worshipped in Maharashtra and neighboring regions.
The colors and respective Goddess –
Parrot Green – Goddess worshipped is Amba.
Orange – Goddess Tara in some regions, Chamunda in other places.
Yellow – Goddess Shodashi or Ashtamukhi
Sky Blue – Goddess Bhuvaneshwari
Pink – Goddess Chinnamasta or Upang Lalita
Grey – Goddess Bhairavi or Maha Kali
Green – Goddess Dhumavati or Jagdamba
Ink Blue – Goddess Bagala or Narayani
Royal Blue – Goddess Matangi or Renuka
Red – Goddess worshipped is Kamala or Durga
(Please note this has nothing to do with deciding the color.)
The nine Navratri colors are Red, Orange, Yellow, Sky Blue, Pink, Grey, Green, purple and Royal blue. (Also Parrot green, white, peacock green etc are found in some years)