Duckwings, if bred in a sex-linked manner or any manner in which you can get Golden type males. Also, some duckwings can be sexed by the position and amount of "eyeliner." It all depends on the parents though, but lighter yellows with less showy and bold of stripes are often males, and often Golden Duckwing in color.
Also Cuckoos can be sexed. Not everyone has them but many people don't realize some of their Araucanas have residual barring, that when born, is very apparent. Males have a large, smeared yellowish sometimes white spot on the head and neck, females a small yellow to white colored dot on the head.
Any other color is too hard to sex by color or just simply can't be sexed by color. However, I find if an Araucana is a cross of black/blue/splash and another color, the girls are born with more blue/black/splash influence than the brown or gold appearance from the other genes. (usually duckwing)
What I mean is, if a chick is kinda two-toned but not in a striped or marbled way, the more red or yellow on it (usually in the face), the more likely it is a boy.
