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It's important that the rooster be 1. homozygous for the blue shell base gene and 2. single-combed in order to be reasonably sure that the pea-combed offspring are homozygous. The blue egg gene is very close to the comb shape gene on the chromosome, so when the pea comb from the olive egger...

Wow, what a beautiful shade of olive! That's a great amount of brown pigment/blotch for an EE/brahma cross! I haven't heard any other reports like this, but anecdotally, I once had a case where an easter egger who was just starting to lay laid a blue egg, then a white egg, then blue for the rest...

The only chicken that breeds true for a remotely dark green egg is the Swedish Isbar, an expensive and hard-to-find variety which often lays disappointingly pale eggs. To remedy this, I've come up with a strategy to quickly create olive eggers that are homozygous for the blue shell base gene...