But Which Leaf?

After mentioning in a previous post a character in a novel whose hair color was described as feuille morte (dead leaf), I began to wonder just which dead leaf. They do come in a variety of shades. 
 Further online investigation led me to a definition of brownish-orange or yellowish -brown. Or ochre or sienna.
Then I remembered another novel and another odd French name for a color--a woman was describing a silk ball gown in a killing merde d'oie. Aka goose shit green--a brownish-green. 
I thought that sounded fairly unattractive, but then I stumbled on a shade called caca de dauphin. Those French! The (probably apocryphal) story behind this name is that Marie Antoinette was holding the baby prince when he pooped all over her. Rather than being disgusted, the queen marveled at the color --yellow, as is common in young breast-fed babies--and ordered a dress of that exact color--which color, of course, became popular in court circles.
Until the Revolution.