Colorful Eggs for Easter

Out of all the various projects that we do, some of which are SO elaborate (the cookie Solar System got made again this week!), often it's the simplest that are just right for the moment, as with the happy morning that the little girls spent dyeing Easter eggs:

 
 
 
 
 
Just vinegar, food coloring, and warm water--why don't we do this for EVERY holiday?