These are fun to make as well as to crack on someone’s head... And though this fits into the "paper crafts for kids" category (even the youngest can do these, if the shells are prepared for them), I like to make confetti eggs too!

Have prepared a couple dozen blown (or otherwise scooped-out - soft-boiled?) eggshells - the main hole can be up to about 1" across (and ragged-edged is okay). If there are "exit holes" too, cover them now by pasting a small piece of tissue paper over them. Cut and/or punch a whole bunch of confetti bits out of different-colored pieces of paper. Put a tablespoon or so into each eggshell, then seal the main hole by pasting on another piece of tissue paper (with perhaps some decoration on top - a sticker? a tiny tissue paper flower?). They’re ready to break... Just be prepared to clean up too. (I remember these from Olivera Street in Los Angeles - so perhaps this is a Mexican invention?)