Shells are blue and are some rare breed thingy.
Tellingly they were marked down below £1 for half dozen even though they were a week before the sell by dates. One imagines the plebs coming along taking one look and saying "Eek! blue eggs, I ain't feeding them foreign genetically engineered things to my children" whereas TG comes along and says "ooh, blue eggs, another delightful culinary experience to savour and they are fucking cheap as well."
I had eggs on toast for breakfast yesterday. A normal one and a blue one. The blue one was definitely tastier.