So I was making omelets the other day, and I was thinking it might be fun to have a list of interesting omelet fillings, for those days when you want to try something new. Since I can't figure out how to let us all edit this post, we should add more ideas in the comments.
Tomatoes with Browned Garlic, Mozzarella, Parmesan and Basil:
Dice tomatoes, garlic, and optionally green onions. Brown garlic in olive oil, add green onions briefly, then add tomatoes - remove from heat, but keep stirring. Add the mix to the omelets with mozzarella, Parmesan and fresh basil leaves.
Mushrooms in Wine, with Basil and Rosemary:
Cut mushrooms into small chunks (I liked to leave them a little chunky). Brown in lots of butter (again, optional green onions), salt, add white wine. Cook down. Add basil and rosemary to the eggs. You could do this with or without cheese. I think I used Parmesan, cause that's what I had.
Mix za3tar spice mix with olive oil until it makes a liquidy paste, then add to the omelet. It is also good with some green olives.