T.P.
You could pickle them...they would keep for a long time in brine. I can't really think of too much else to do with already cooked eggs. Chop 'em up and throw them in a salad? I eat a hard boiled egg every day sliced with salt and pepper and toasted with a little butter on a piece of wheat bread. Its a nice balance of protein, carbs and good fats to start the day.