I'll tell you what is not for breakfast: vegetables.
Notice that I managed to use a colon correctly, I think. I really like vegetables and I've heard rumors they are nutritious. Yet, when perusing the breakfast menu at a restaurant, the only token vegetable other than potato appears to be the queen of transgender foods: the tomato. (Is she a fruit or is she a vegetable? If she appeared on Dancing with the Stars, with whom would she be partnered?)
Why is the only corn we consider for breaking our fast FLAKEY? If we can work zucchini, beets and carrots into dessert, why not work it into breakfast? Yes, I've heard of the Denver omelet - some green peppers make an appearance along with some onions. But barely. They are mere decorations for the copious amount of ham and cheese.
Spinach omelets always seem to contain about 12 servings of spinach (I imagine the cook thinking, thank God I can get rid of all this spinach) and a vegetarian omelet is usually a Denver omelet with mushrooms instead of ham. News flash - mushrooms are not a vegetable.
Try scrambling some corn in your eggs. It is delicious! Try serving roast vegetables fresh from the oven instead of hash browns. Yummy! Get crazy with the idea and throw some creamed corn into your pancake batter. Yowza!
Truthfully, though, this isn't a big issue for me. I don't usually eat breakfast. Until someone invents coffee-jerky (and I cannot tell you how many hours I've spent researching it with no luck), I'll probably continue to drink my breakfast: coffee with a little cream.