I agree with Mrs. Mikey.
I'd rather have people notice the masonry because it's done so well,
not because it's dyed to be noticed. But that's just me.
I recently talked a client out of dying her mortar green cuz she wanted it to look mossy.
Not only did I save her money, her mortar is green with moss already.
I just don't like dyed mortar at all.
Now grout, that's another thing....