Seriously. Pizza.

Since you are vegetarian, slice of cheese pizza. If you have a Whole Foods that sells them by the slice, that is good. Buy a few slices, take them home and freeze them. Microwave for breakfast.

Or for nutrition--if you can have fish? If so, canned kippered herring is good, especially with sliced tomato and a few saltines.

My usual breakfast is plain microwaved oatmeal with a tablespoon or two of wheat germ, plus a few shredded wheat kernels on top, and then plain lowfat kefir or buttermilk and maybe a few tablespoons of plain Greek yogurt. Almost wish it were time for breakfast, thinking about it. But I don't expect to convert many people.

Anyhow, pizza. Or cheese toast if you have the time. And an orange or banana and vitamin tablet. And maybe lettuce.

ETA: If you're really tired of the usual line-up, consider microwaved corn tortilla topped with salsa for a perfectly satisfying breakfast. Messy if taking it outside, of course. And might need a bit of sour cream or cheese if it has to last you till lunch.