I dont have kids in school yet...but i used to work in 2 OOSH care centres before i had the girls.

Every after noon they would eat something nice like:

Platters of fruit
Mini pizzas (muffins with tomato paste, cheese, ham)
Sandwiches
Ice cream (hmm not so healthy there) with fresh fruit
Pasta with tomato sauce (the bolognaise stuff in a jar)
Cruskits with a variety of spreads
etc..etc

Then they could buy not so healthy foods like:

Popcorn
Frozen sunny boys/long frozen juice blocks
Frog lollies
Mamee noodles
Roll ups
Space food sticks

Basically junk food....but was only allowed 2 days a week they were in care (eg. if they were in 5 days..only 2 days were allowed to go buy junk).

As a kid i was never allowed afternoon tea!