Or can I get blue yolks?
(http://www.robotmation.co.jp/keiranycceng.htm)
Range from a very pale yellow to a deep orange colour.
Different countries have different preferences.
EDIT: Here's a Tufte page about Salmon colour charts.
(http://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=0...)
Blue would be hard since blue + yellow = green.
Or can I get blue yolks?