Green

Green was the official colour of mourning in Perfugium, as it symbolised death and a return to nature. (AUDIO: Master) Sontarans had green blood. (TV: The Two Doctors)

Many species had green skin, including Alpha Centaurans, (TV: The Curse of Peladon) Etydions, Foamasi, Ice Warriors, (TV: The Curse of Peladon) Jadeans, Jagaroth, (TV: City of Death) Kleptons, Primitives, Rutans, (GAME: The Gunpowder Plot) Silurians, (TV: The Hungry Earth) Swampies, Urbankans and Vinvocci. (TV: The End of Time) Infant Chimerons and larval Wirrn were also green.

Stahlman's ooze was green. (TV: Inferno) The waste from Global Chemicals' oil-refining process was green. (TV: The Green Death) The sky of an Earth-like planet was green, (PROSE: The Sour Note) as was the sky of Arcopolis. (PROSE: The Eyeless)

The Eighth Doctor remembered watching a meteor storm in the sky above him during his original incarnation. He said that "[t]he sky [...] was dancing with lights; purple, green [and] brilliant yellow." (TV: Doctor Who)