Apologies for not reading the whole topic (in case this was mentioned earlier) but will color still be a work in progress?
If one wants a good forager that is effective, I'd assume color is a big importance to keep the bird from being spotted by predators, yes?
For example out here I try and keep from having solid colored birds or pale colored birds, and aim more for colors like silver laced, silver duckwing, blue partridge, and any wildtype pattern (BBR, partridge, crele, mutt colors) Out here the hens are on a large pasture of grasses, stumps, twigs, shrubs, and logs - The best blending colors for ALL seasons here are mixed up black, brown, white, or even bits of blue or gold. A sort of fall theme is best, since winter fall and spring all look the same, and summer only differs in a little more green, little less brown/orange color.