Thanks for all the info, it's certainly a lot to digest. My first mistake was being impatient and picking the chicks up at a commercial joint, rather than looking around for a breeder. With a little more information, I'm sure it would be easy enough (given the patience) to find a breeder that might be able to provide me with a chick that could likely lay a blue egg, or even come across a laying hen that is already producing blue eggs.
As for pink, it sounds like that is even more rare. If I can get a blue laying hen, then brown and white would be easy enough to add color to the collection!
My Buff Orpingtons lay a pink tinted brown egg. Very light pale looking. I can always tell which eggs are theirs.