As they grow bigger and older, their eggs will get bigger, too. The eggs in back are from the older girls. I didn't set this up—the chickens like to share laying boxes.
Fresh eggs are no good for hardboiling (they won't peel well), but they poach perfectly. Simmer water in a pan, slide the eggs in, turn over once. When done, lift out with a slotted spoon. Season. Mmm.
Update: Since writing this, I've seen Jules' poached egg experiment and tried it myself. Take a look at what a difference a little glug of white vinegar makes:
I'll definitely be adding it to the water from now on.