Thelka
From Tardis Wiki, the free Doctor Who reference
Suppossedly an uninhabited planet, there was a colony established for a while on the planet Thelka in the year 2495 which was subject to the influence of a Aranjia advance party which arrived through a wormhole and eradicated the colour blue – even from the sky until the Doctor and Amy Pond’s intervention. (DWAM: Blue Skies Thinking)