pepper, tabasco sauce.... anything along those lines if you like the hot stuff. Personally, i'm not a REALLY spicy (i mean burn my lips off... habenero type) person, a little spice I can deal with. So jazzing them up as far as I go is to open the throat and relax the jaw, let the liquid egg whites (pasteurized for saftey of course) flow straight to my stomach ... if your not down with that, I think i'd opt for shaking a little pepper in i guess.
My bf said the same thing, I got him hooked on putting some of my veggie bacon in with his eggs, changed it up a bit.
It’s also a good source of added protein; 4 slices (76g) has 22g of protein, 106 cals, 2g carbs and 0.8g fat.