When I was a kid we used to eat Kraft mac & cheese with tomato sauce (we call it Ketchup in the states) on top. Also Ketchup on scrambled eggs was a favourite. My brother and sister used to put ketchup on peas or mashed potatoes as well.
I went through a phase where I had toasted cheese and peanut butter sandwiches and got hooked on vegemite and cheese here for awhile. There was a pizza place near our house that used to make a mean vegemite, cheese and garlic pizza but they closed down.
That is about all I can think of right now...