We tried out Veggie Pizza today for a snack (http://www.childrensrecipes.com/) It was not a big hit for my toddler, although I think it would be great for older children who aren't afraid of trying new and different foods. It is very colorful as you can see. Next time I think we'll skip the pizza crust and just use it as a dip. That way my son can pick out his favorite veggies and not worry about the rest of them.
For a little art project we did this: It is a paper plate and pieces of paper for the cheese and toppings and my son colored the plate with a red marker for the sauce. You can find more complete instructions by going to www.everythingpreschool.com looking up pizza and then going to the art section.