My Harter Dels are 6 weeks old, and leg color is a mixed bag. I read back through here and am curious, Kathy and Michael - did you get chicks from BOTH Paul's pullet line and hen line or just one or the other? I have both, and I have medium yellow legs, medium yellow legs with a greenish tinge, pale yellow legs, and pale yellow legs with a greenish tinge. Will try to get pics up.
I feed Purina Chick starter, and they are in a pen with grass, sun and shade.
I had a poultry expert from the state out here and he said the good leg color can still "come in", give it time. Kathy's info on the marigold extract is fantastic, Xanthophyll ( excuse my spelling) is the same "good thing" that helps makes the egg yolk a great golden color, so dark leafy greens like kale should help.
Overall, are you liking the little barns? I am really delighted with the roundness of mine.