Peacock blue.

Mother Goda Devi!
Your Hue that is green
Like the leaf of Druva grass
And Lakshmi's complexion
Which is golden as gorochana
have combined to give the Lord
The shade of the peacock's neck.

Nammalvar uses the combination of colors to present simple images of the Supreme vision:
"Bearing the yellow garment
Bejeweled from the crown downwards,
Flame lipped and red eyed,
your green glorious body
Reclines on a snake
That's poisonous and fierce.
You then appear to me
As the emerald mountain grand
That's adorned with red clouds,
The russet sun and the pleasant moon, 
Lying on the sea kings palm."

Sri Aurobindo says the dark blue figure of the Lord is joined by the green hue of Goda Devi, she shines like a leaf of a grass doora dala pratima, the mother earth is sasya syamala. Green he says is symbolic of work and action. Green light can signify emotional generosity it also signifies a force of health. the names are significant as Vasundhara, Vasudha, Vasavi, Hiranyagarbini.
The Blue and dark green are joined by the golden colour of Lakshmi devi. signifying truth, hence Ananda consciousness, generosity and understanding the truth.
Vedanta desika says sikhavala kanta sobha. the colour of the peacocks throat the utmost bliss the Madhuvairi the Lord flanked on either side by the goddesses. mangala murthi giving Pranamataam mangalyadam.
Parasara bhattar also says while surrendering says I surrender to Lakshmi who swims as a royal swan in the divine pond of Sri Ranganatha and Bhu devi who is like her increasing shadow.