On this paint over, I went for a dark orange and dirty kind of theme. The lights are old and faded. and mold has grown up the walls.
A crazy green theme is used here, plus blood as a contrast. Not really what we are looking for though.
I uszed a rusty and wet theme here. Water has covered the flood and rust is coming down from the pipes.
A concept painting of the main tree in the atrium. Later realised that the area would need to be a lot more overgrown and also the roots of the tree should be along the floor or bursting out of a crack. Also experimented with dust particles/flies/pollen.