This wasn't nearly as hard as I thought it would be. I had some lovely and perfectly filling lunches (below).
However, "going vegetarian" does not necessarily equate to healthy eating. For example, here is a list of completely and perfectly vegetarian foodstuffs that definitely do not constitute a healthy lunch.

2) Chocorooms (left): Addictive little Japanese biscuits with chocolate in the shape of mushrooms. Like real mushrooms, they are cholesterol-free.
3) Communion wafers: these have obvious spiritual benefit.
4) Soft drinks, specifically diet Cherry Coke. Absolutely no nutritional value, but on a Thursday afternoon that included a carpool, a broken car radiator and a funeral, emotionally, it ranked up there with the communion wafer.
5) See's Candy Molasses Chips and Dark Chocolate Frango Mints
So while I won't give up four legs, feathers or gills completely, I can envision 2 or perhaps even 3 vegetarian dinners per week. A friend of mine has the great suggestion of roasting vegetables over the weekend, storing them in baggies and then using them throughought the week.
So I can definitely see vegetarian lunches exclusively. As long as it's not Chocorooms, potato chips and Diet Coke. At least not very often.
Eat Well. Be Well.