Nature's Harvest eggs (I think that's the name) have lots of omega 3s (pick the right variety). Scramble with bell peppers, onions, cooked/leftover potatoes, etc, maybe with a little hot sauce or cheese for kick and it's delicious. My 3 and 6 year old boys eat that (but do sometimes pick out the vegies).
I am from the southwest and love to have corn tortillas spread with refried beans, salsa or enchilada sauce (or El Pato tomato sauce) cheese, and eggs served over the top, maybe with potatoes on the side (eggs can be scrambled or fried). Yummy! My kids will eat that too; I sometimes serve it for dinner. It' pretty easy with canned beans and sauce, just warm the tortillas (toaster oven works), beans in the microwave, cook the eggs, etc.
I sometimes put diced apples in oatmeal, and if we can get to a blueberry farm and pick 50 pounds and put them in the freezer, we have enough for the year for oatmeal. Frozen blueberries cool the oatmeal while they thaw, so it's not hot for the kiddies, and they love it.
I know some people think pancakes are evil, but to me, using whole grain flour (wheat or buckwheat), scant sugar if any, eggs (I believe they are they perfect food) and milk (even soy or rice milk), I think they are wonderfully nutritious, especially if using just a teaspoon of syrup or jam, and just a smidge of butter (smart balance has high omega varieties). I've trained my kids to just use enough syrup to spread a thin layer on top, so a bottle lasts us months, and I make pancakes/waffles/french toast a couple of times a week.