I would name it Gallifrey. And it would be a yellow-orange planet with a quantum force field as well as an impenetrable force field (transduction barrier). I has bright, silver-leafed trees and a burnt orange sky at night that would cast an amber tint on anything outside the city. There would be mountains with fields of deep red grass, capped with snow. It would be in a binary system and the second sun would rise in the south and the mountains would shine, with the silver-leafed trees looking like a forest on fire in the mornings. Basically I want to be a time lord