I don't know of any linkage between the shade of blue/green of the egg. To selectivly breed for a certain shade of blue/green I would recommend tracting which eggs are comming from which hen. Especially those early pullet eggs before the brown egg genes fades. You also might track the offspring on you rooster to track what % are the color you are looking for.
As far as the crest color...I would say to deffinatly keep the gold color over the black color. I have one cream colored hen that started out with a black crest, but after her first winter moult it now showing mostly cream.

All of my pullets are showing black crests, but I am keeping my fingers crossed that some gold or cream crests come out of the lines int he future.