I forgot about this'n, but Grisly reminded me. Once in some little burg outside Portland I had an omelet that contained bacon, ham, sausage, cheddar and jack cheeses, onions, mushrooms, and green peppers. It came with a huge mess of hash browns, and the whole thing was topped with sausage gravy. I wouldn't try to eat it again, but it was mighty good that one time.
If I'm cooking at home, they usually contain cheddar and onions, and sometimes bacon. Every now and again I'll make a dessert omelet of cream cheese and some variety of jelly. Grape or strawberry, as a rule.
James