yes, you can possibly get colored from breeding a yellow but it's not garunteed. Breed two birds of the same color and you get that color 100%, with the possible exception of a dif color if the colored parents came from mixed stock but I haven't seen that happen as mine are all from original colored stock.
Get cards from Hali or one of the other breeders in our ls. I've been supplying blue female and male cards to the ls and so far every single blu x blu has resulted in a blu chick. But Hali and neyla are on alot more then I am so it's easier to get cards through Hali.