Oh...pasta!
All kinds of shapes and sizes, including favorite cartoon characters, but the ziti and linguini shapes can be fun as well.
Add tomato sauce, meat sauce, alfredo sauce, or just plain butter and parmesan. You can slip in some slivered vegetables and some chopped meat as well if you like.
Be sure to declare a "no manners expected" night once in a while so they can slurp the long stings up and stretch them out to see who has the longest, etc.
Another favorite is sloppy joes.
Check out familyfun.com for lots of great kid-pleasing ideas.