I freeze the yogurt in Matilda's bag and use that as the ice block in her lunch bag (we have an insulated bag we use). I often send her with things like mini quiches, yogurt, I use mini wheats cereal as a snack, rice crackers, vegemite sandwiches, I slice my own cheese or cut it into cubes, tubs of fruit, cruskits.... Matilda now eats carrot sticks as well which I put a bit of cream cheese on the end.