You said that you "know" all your budgies are males, have they been DNA tested? I have seen and had males that the ceres are lighter or darker than the others but have also had females that will have odd colored ceres sometimes getting them confused with the males. In the rescue we have all the birds sexed whenever possible with their initial vet exam but we don't always do this on the smaller birds. It is however a definite way of sexing when one of your budgies with a bluish cere suddenly lays eggs, even though we and the vet were sure it was a male and there are no other birds in the same cage LOL! SO even though the coloration of ceres is about 98% accurate in sexing budgies like many other bird species it can sometimes turn out wrong.

So after rambling on for a while in answer to your question, I have seen male budgies with both lighter and brighter blue ceres, I haven't personally seen any with white but would imagine that it would depend at least in a small degree upon the birds overall color even in same sex birds.

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