fake eggs could be smashed like real eggshells and made into mosaics.
egg-halves could also be turned into flowers, toad houses, doll furniture, etc.
they could be used as cookie cutters.
they could be attached to the outside of a sphere, open sides outwards, to make an ornamental mod whatsit, i don't remember but i have seen one made with plastic cups... maybe it was a lamp, too?
i am going to make a different kind of lamp so if you like any of these ideas, go for it.
Totally wrote one of my ideas. Guess I wasn't as orignal as I thought, back to the drawing board!
I've never done a challenge before, but this one seems really, well.... challenging!