Hey, it's not up to me to make it official, lol. You guys can go right ahead greening the place up tho, unless we/Admin definitely say stop
Invisible yellow or white are a bad idea though. We tend to assume that means illegal spam.
I recently used gold/golden rod. Yellow was too difficult to see as you say so darkened I it.
Felt it wasn't strong enough for green, but it needed something more than normal. More tongue in cheek than sarcastic. Post disappeared/ got deleted though LOL