Since enough mess has been made with the art project, you can just lay out the food for everyone to tuck in. To make things a little more interesting though, try to get the kids involved in what they are eating. You don't have to have an elaborate spread. Cake This will be the piece de resistance. Your theme will dictate the shape of the cake, which is more important than its taste.
Few people expect the cake to taste good, and it almost seems like a bonus when it does.
You can go about it two ways, ask your child to choose the flavour and even help out in specifying the decorations. Or if you prefer, you could leave it all as a big surprise. Try not to worry too much about the inevitable mess, it can be cleared up. All it takes is a little imagination and effort and you will be able to host a very successful children's party. Birthdays come round only once a year and before long, your children will be wanting to go out with their own friends to celebrate on their own.