Unfortunately my work only provides a dodgy microwave and fridge in our kitchen, otherwise I would take in home made pies - a favourite lunch for me at the moment. If I have leftovers suitable for microwaving I take them to work, but I must confess I tend to buy my lunch most of the time. Gives me an excuse to get out of the office!
What about Maddy's bacon & cheese rolls? My kids love them in their lunchboxes - also Amy's cheese & zucchini mini quiches, you could make them as larger quiches to take to work.
What does your work provide Kath? We don't even get tea, coffee or milk, have to bring your own everything!