Do you like greek salads? Instead of parmesan, use crumbled feta cheese and kalamata olives (okay, expensive I know)
Do you like fish? Buy a small can of clams, add it to the Ragu when you simmer. Chewy!
Or add a can of WELL DRAINED tuna (in water) , but don't simmer this one, just stir it into the sauce right before serving.
Both of these are also good w/ with olives (any kind you like) and parmesan or feta on top also.
Do you like spicy? instead of just ground beef, use sausage or 50/50 sausage/beef and add some chili powder mix like Mexene (tablespoon or so). This is disturbingly orange, but tasty :)
Ragu always needs doctored IMO just to be tomato sauce, in that it's too sweet and and too thick.. I'd add olive oil, and a basic italian spice mix, some mushrooms and can of diced tomato and end up with twice the sauce :)