Eichler Concrete Recipe requested

Does anybody know the Eichler concrete recipe or or mixing method? I'd like to create the same type of pebbly faced concrete that is on our patio and drive way, but I can't find recipes or methods online for achieving that speckled affect. Everthing I have seen sets a smooth gray. I'd greatly appreciate finding out what the recipe and/or methods are for achieving that original look. Thanks much in advance! jamescolloquan at yahoo.com