@Preston: Hah, thought someone would bring up retrovirus genes. I won't disagree about the 'hair-on-fire' freak-out -- people who don't know genomics can be very scared of deliberate human genomic manipulation. But there is a difference, in some people's minds, between:
1) The gene that causes blue eggs was already in chickens and it just got turned on.
2) The gene that causes blue eggs came from a non-chicken source.
The Gag, Pol, Env genes carried by retroviruses are not the cause of the blue egg so they are easy to ignore (not to mention being found all over, in one form or another, the chicken genome anyway.) But the 'blue egg' gene -- natural and native to the chicken? ... or foreign and non-native? (OMG!)
The parallels to some people's reactions to GMOs should be obvious. Unfortunately we cannot, in good conscious, use the 'blue egg' gene to say to the non-geneticists, "hey nature does it so we can do it as well and as safely."