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 Power of Kroll, Four to Doomsday, The End of Time) Infant Chimerons (TV: Delta and the Bannermen) and larval Wirrn (TV: The Ark in Space) 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)