Once the temple had been assembled it was undercoated in a light grey and then dry-brushed tp within an inch of it's life.
Various Games-Workshop colours including Deneb Stone, Bleached Bone and Skull White being the main ones. I also used various inks - to emphasise cracks and changes of surface.
Then I started to add greenery.
Normally when we see classical ruins they have been sanitised by the Department of Works (or the local equivalent). Normally vegetation climbs up, through and around the stone work. Grasses and shrubs get seeded in crevices where columns meets floors etc.
So with the assistance of some Woodland scenics poseable trees....