Lots of things you can do.
Pastry parcels stuffed with cheese and veg (sun-dried tomatoes, sundried peppers and a bit of basil is a good combo). Great served like a roast or with a side salad.
Mushooms and cream go so well together. Be it mushroom strongronoff. Or a mushroom cream and white wine sauce on pasta, gnochi or in a risotto.
aubergines are fabulous. They can be turned into a layered pasta bake, used in a spag bol type dish. Stuffed or bread coated and fried served with a dip as a starter.
Things like a good cheese pie or vegetable pie with mash and mushy peas.
Or far eastern. Been curd curry is heavenly.
Or as some one else above, Indian currys.
Vegetarian lasagne is great.
Make a spag boll out of aubergine to replace the meat. Layer up. Sauce > spinach > grilled thinly sliced butternut sqaush > pasta > cheese sauce. repaeat several times.