Kathleen, I have to let you in on something.
When I first read Frank saying you were taking hard cooked eggs and dying them blue, for some reason I had this picture in my head of deviled eggs with blue filling. With my knowledge of colour and of food, I was about to write and say that you should be very careful of adding blue to the yolk/mayo mixture because the blue might not come out so nice. Then I re-read "hard boiled" and realized you were leaving them that way and dyeing the shells.
Can someone please shut the door on my cave and wake me up when hibernation season is over!