This is a vast question. Here are some of my favourite things off the top of my head.
Falafel burgers (chick peas whizzed up with some coriander, cumin, garlic, parsley, fresh coriander) with humous, harissa, halloumi, rocket etc. Think I nicked that from Giraffe actually - seem to remember they serve it with grilled red peppers in the bun too.
Pasta with a million different sauces. My favourites are puttanesca (has a couple of anchovies in, if you don't mind including a tiny bit of fish), or broccoli with garlic, cream and loads of parmesan - steam the broccoli til it's soft so it starts to break up as you stir it in. That's also nice with anchovies actually, as is broccoli with poached eggs and anchovy butter.
Melanzane parmigiana (ie aubergines).
Lebanese mezze - humous, baba ganoush, halloumi, tabouleh, flatbreads.
Home-made garlic mushroom and mascarpone pizza, with dried chilli flakes sprinkled on top.
Big flat field mushrooms baked and topped with fresh spinach, blue cheese, breadcrumbs (if you happened to have a couple of rashers of bacon knocking around you could crisp them up and use them instead or aswell).
Baked potatoes with cottage cheese (much the best topping imo) and salad.
Gratin - you can put anything in. Use your favourite creamy soup as inspiration, eg leek and potato.
Ploughmans lunch with cheese and homemade soda bread rolls (take 20 minutes, can be flavoured with cheese and mustard)
Risotto - butternut squash, sage and parmesan; spring veg eg asparagus; mushroom (all of these are best if you make them with chicken stock, but veg stock is fine too).
If you don't mind compromising, you could always have a mostly-veggie meal using meat as an accent rather than main ingredient, almost like a seasoning: eg, spinach, red onion, tomato, cheddar and bacon salad, with mushrooms if you like them raw.
Hope that helps.