We just did DD's party last week and the food went down a storm as they could keep coming back and picking then running off to play again after. We did ham/cheese/tuna sandwiches, veggies and cheese cut into sticks with hummus dip, crisps, fruit kebabs (on thin plastic drinking straws), chocolate finger biscuits and birthday cake. So a mixture of healthy but also party type foods. The kids (and the parents) loved it and we didn't have much left over, a good sign.