When my kids were young, I'd make home-made pizza with lots of vegetables. One thing that's fun:
Lay out the pizza - top it as if you're going to play tic-tac-toe.
Make the matrix out of black olives; they make the vertical and horizontal 'bars' easily and show up great.
Cut up green peppers - they become the 'rings' or the O's that you'll put in some of the squares.
Cut strips of red peppers for the X's - looks and tastes great!
Use fresh tomatoes; chopped finely - sprinkle those down with the tomato sauce.
Fun - happy; think up other ideas that get your family involved; sit around on the floor with an old blanket as if you're having a picnic. Turn on some great music - it's all going to turn into HAPPY TALK!