I got one pullet that is so lovely.....she was a cross from a Buff roo x Blue Wheaton pullet and she ended up like a buff pencilled color with some black spangles on her neck and a darker muff.
If you are not particular about breeding for colors but want to get \"wild\" with colors, go for it but stay within the body standards for the Amercuanas...olive leggers seems to crop up in some strains or bloodlines....If it is not the color you want out of the cross, you can sell them off and try again with different colors. Genetics is pretty tough to determine in colors of birds even they dont breed true.
I would imagine Black x Silver might be Silver birchen color but I could be wrong. Might be weird to get some form of Black Sex Link color out of the crosses with some black x gold or red.
How about Barred!!!! (eww)