Any suggestions or ideas of party favors for a 2yrs birthday celebration?

When it comes to party favours, I'd like to make sure there are at least 3 things from 3 different aspects of life inside -- food, toy and something related to education. So for food, the skies the limit but bear in mine some parents will not be too pleased with candies and junk food. Also there might be certain dietary restrictions for some kids. For toys, I've been to a party once where teething rings were the party favours. I've also seen those squeaky bath toys and those wind up toy animals that can move. As for the educational component, can't go wrong with non toxic crayons, notebooks or even a pocket sized baby book.