I have seen this idea in other places, and I'm sure you can get a lot more creative, but this is how we like to do it. The girls made these the other day. This is a great one for kids to put together. (Makes them feel quite important! :) Also great if you have left-over ham.
Ham and Cheese Mini Pizzas by Lyd Whole Wheat English Muffins 1 small can of tomato sauce Pizza Seasoning Ham Cheese
Spread tomato sauce over muffins, sprinkle pizza seasoning, and top with ham and cheese. Bake at 350 for about 10-15 minutes, or until cheese is melted.