A couple things I absolutely love the flavor combos of are a toasted bagel (preferably an everything bagel, or an onion bagel will do) w/cream cheese and breakfast links. I make it just like a sandwich. Toast the bagel, slather some cream cheese on both sides, throw 3 or 4 sausage links in the middle (has to be the links). Mmmm..Mmmm.
Also Waffles w/ Peanut butter and syrup. Delicious!!
Another would be a toasted bagel with cream cheese and jelly. My dad used to eat these when I was a kid. I thought it sounded and even looked disgusting. I would see him in the mornings, I was getting up for school and he was grabbing his coffee and bagel w/ cream cheese and jelly and headed out the door. For years I thought "how gross". Until 1 day I tried it. It was AMAZING!!
I know other people who do this one also but my girlfriend hates that I eat this for some reason. I think its because it's cold. Leftover meatloaf. I'll make sandwiches with it. Toast some bread. Little bit of mayo. Nice big ole slice of meatloaf on there. Love it.
One combo I've tried is absolutely horrible. My favorite meal of the day is breakfast if u can't already tell. Now, I always have a hard time in choosing whether to have a glass of milk or a glass of OJ with my breakfast. I like them both. Equally. So one day I thought, why not have them both. No, not in seperate glasses. Together. Mixed in one glass. I was thinking positive. Like it was going to taste like an orange creamsicle. Man I was wrong. I had a hard time keeping that gulp down.
Well I'm sure there is more, but these are what I could think of off the top of my head.