We do homemade muffins and smoothies (easy if you make the muffins ahead of time and freeze), cream of brown rice, baked oatmeal and a yummy baked french toast.
Some really simple ones are apples with peanut butter and leftover rice drizzled with honey and served with milk..
My friend suggested making your own version of the fast food breakfast sandwich and freezing them for a quick, healthy breakfast especially for dads. I really like this idea, but haven't tried it yet.